User blog:Planterobloon/XP Requirements for All BTD6 Tower Upgrades

This looks ugly, since it was originally a Notepad file, but here's all the XP unlock requirements. You can't view these after you unlock the upgrades AFAIK, so I collected them during my first few games.

Dart Monkey
 * Path 1
 * Sharp Shots: 100 XP
 * Razor Sharp Shots: 500 XP
 * Spike-o-pult: 1,900 XP
 * Juggernaut: 7,500 XP
 * Ultra Juggernaut: 22,000 XP
 * Path 2
 * Quick Shots: 80 XP
 * Very Quick Shots: 400 XP
 * Triple Shot: 2,000 XP
 * Super Monkey Fan Club: 9,500 XP
 * Plasma Monkey Fan Club: 30,000 XP
 * Path 3
 * Long Range Darts: 50 XP
 * Enhanced Eyesight: 450 XP
 * Crossbow: 2,100 XP
 * Sharp Shooter: 12,000 XP
 * Crossbow Master: 35,000 XP

Boomerang Monkey
 * Path 1
 * Improved Rangs: 100 XP
 * Glaives: 520 XP
 * Glaive Ricochet: 2,500 XP
 * MOAR Glaives: 8,500 XP
 * Glaive Lord: 37,500 XP
 * Path 2
 * Faster Throwing: 120 XP
 * Faster Rangs: 550 XP
 * Bionic Boomerang: 2,500 XP
 * Turbo Charge: 9,000 XP
 * Perma Charge: 32,000 XP
 * Path 3
 * Long Range Rangs: 110 XP
 * Red Hot Rangs: 490 XP
 * Kylie Boomerang: 3,000 XP
 * MOAB Press: 9,500 XP
 * MOAB Domination: 28,000 XP

Bomb Shooter
 * Path 1
 * Bigger Bombs: 200 XP
 * Heavy Bombs: 1,000 XP
 * Really Big Bombs: 3,000 XP
 * Bloon Impact: 10,000 XP
 * Bloon Crush: 37,500 XP
 * Path 2
 * Faster Reload: 180 XP
 * Missile Launcher: 650 XP
 * MOAB Mauler: 2,700 XP
 * MOAB Assassin: 10,000 XP
 * MOAB Eliminator: 35,000 XP
 * Path 3
 * Extra Range: 150 XP
 * Frag Bombs: 600 XP
 * Cluster Bombs: 2,500 XP
 * Recursive Cluster: 10,000 XP
 * Bomb Blitz: 25,000 XP

Tack Shooter
 * Path 1
 * Faster Shooting: 150 XP
 * Even Faster Shooting: 550 XP
 * Hot Shots: 2,400 XP
 * Ring of Fire: 9,500 XP
 * Inferno Ring: 32,500 XP
 * Path 2
 * Long Range Tacks: 140 XP
 * Super Range Tacks: 500 XP
 * Blade Shooter: 2,300 XP
 * Blade Maelstrom: 9,000 XP
 * Super Maelstrom: 28,000 XP
 * Path 3
 * More Tacks: 150 XP
 * Even More Tacks: 490 XP
 * Tack Sprayer: 2,450 XP
 * Overdrive: 8,750 XP
 * The Tack Zone: 26,500 XP

Glue Gunner
 * Path 1
 * Glue Soak: 150 XP
 * Corrosive Glue: 550 XP
 * Bloon Dissolver: 2,500 XP
 * Bloon Liquefier: 9,000 XP
 * The Bloon Solver: 37,500 XP
 * Path 2
 * Bigger Globs: 120 XP
 * Glue Splatter: 900 XP
 * Glue Hose: 2,500 XP
 * Glue Strike: 8,500 XP
 * Glue Storm: 25,000 XP
 * Path 3
 * Stickier Glue: 130 XP
 * Stronger Glue: 600 XP
 * MOAB Glue: 2,500 XP
 * Relentless Glue: 8,000 XP
 * Super Glue: 30,000 XP

Ice Monkey
 * Path 1
 * Permafrost: 160 XP
 * Metal Freeze: 500 XP
 * Ice Shards: 2,500 XP
 * Embrittlement: 8,250 XP
 * Super Brittle: 25,000 XP
 * Path 2
 * Enhanced Freeze: 160 XP
 * Deep Freeze: 500 XP
 * Arctic Wind: 2,500 XP
 * Snowstorm: 8,500 XP
 * Absolute Zero: 27,500 XP
 * Path 3
 * Larger Radius: 160 XP
 * Re-Freeze: 500 XP
 * Cryo Cannon: 2,500 XP
 * Icicles: 9,000 XP
 * Icicle Impale: 30,000 XP

Heli Pilot
 * Path 1
 * Quad Darts: 200 XP
 * Pursuit: 650 XP
 * Razor Rotors: 2,700 XP
 * Apache Dartship: 20,000 XP
 * Apache Prime: 55,000 XP
 * Path 2
 * Bigger Jets: 150 XP
 * IFR: 650 XP
 * Downdraft: 3,300 XP
 * Support Chinook: 15,000 XP
 * Special Poperations: 40,000 XP
 * Path 3
 * Faster Firing: 140 XP
 * Faster Darts: 550 XP
 * MOAB Shove: 2,500 XP
 * Comanche Defense: 12,500 XP
 * Comanche Commander: 50,000 XP

Sniper Monkey
 * Path 1
 * Full Metal Jacket: 120 XP
 * Large Caliber: 800 XP
 * Deadly Precision: 3,500 XP
 * Maim MOAB: 10,500 XP
 * Cripple MOAB: 37,500 XP
 * Path 2
 * Night Vision Goggles: 200 XP
 * Shrapnel Shot: 600 XP
 * Bouncing Bullet: 2,500 XP
 * Supply Drop: 11,000 XP
 * Elite Sniper: 35,000 XP
 * Path 3
 * Fast Firing: 130 XP
 * Even Faster Firing: 600 XP
 * Semi-Automatic: 2,750 XP
 * Full Auto Rifle: 10,000 XP
 * Elite Defender: 30,000 XP

Monkey Ace
 * Path 1
 * Rapid Fire: 160 XP
 * Lots More Darts: 750 XP
 * Fighter Plane: 2,700 XP
 * Operation Dart Storm: 8,000 XP
 * Sky Shredder: 35,000 XP
 * Path 2
 * Exploding Pineapple: 120 XP
 * Spy Plane: 600 XP
 * Bomber Ace: 2,500 XP
 * Ground Zero: 15,000 XP
 * Tsar Bomba: 30,000 XP
 * Path 3
 * Sharper Darts: 160 XP
 * Centered Path: 600 XP
 * Neva-Miss Targeting: 3,000 XP
 * Spectre: 19,000 XP
 * Flying Fortress: 45,000 XP

Monkey Sub
 * Part 1
 * Longer Range: 125 XP
 * Advanced Intel: 750 XP
 * Submerge and Support: 2,250 XP
 * Bloontonium Reactor: 11,000 XP
 * Energizer: 33,000 XP
 * Part 2
 * Barbed Darts: 130 XP
 * Heat-Tipped Darts: 600 XP
 * Ballistic Missile: 3,000 XP
 * First Strike Capability: 20,000 XP
 * Pre-Emptive Strike: 45,000 XP
 * Part 3
 * Twin Guns: 150 XP
 * Airburst Darts: 1,000 XP
 * Triple Guns: 2,750 XP
 * Armor Piercing Darts: 10,000 XP
 * Sub Commander: 25,000 XP

Monkey Buccanneer
 * Path 1
 * Faster Shooting: 150 XP
 * Double Shot: 700 XP
 * Destroyer: 3,000 XP
 * Aircraft Carrier: 12,500 XP
 * Carrier Flagship: 37,000 XP
 * Path 2
 * Grape Shot: 200 XP
 * Hot Shot: 650 XP
 * Cannon Ship: 2,700 XP
 * Monkey Pirates: 13,000 XP
 * Pirate Lord: 35,000 XP
 * Path 3
 * Long Range: 150 XP
 * Crow's Nest: 600 XP
 * Merchantman: 3,100 XP
 * Favored Trades: 10,000 XP
 * Trade Empire: 40,000 XP

Ninja Monkey
 * Path 1
 * Ninja Discipline: 150 XP
 * Sharp Shurikens: 550 XP
 * Double Shot: 2,000 XP
 * Bloonjitsu: 16,000 XP
 * Grandmaster Ninja: 50,000 XP
 * Path 2
 * Distraction: 200 XP
 * Counter Espionage: 600 XP
 * Shinobi Tactics: 2,000 XP
 * Bloon Sabotage: 14,000 XP
 * Grand Saboteur: 35,000 XP
 * Path 3
 * Seeking Shuriken: 140 XP
 * Caltrops: 500 XP
 * Flash Bomb: 2,500 XP
 * Sticky Bomb: 15,500 XP
 * Master Bomber: 37,500 XP

Wizard Monkey
 * Path 1
 * Guided Magic: 110 XP
 * Arcane Blast: 600 XP
 * Arcane Mastery: 2,300 XP
 * Arcane Spike: 11,000 XP
 * Archmage: 35,000 XP
 * Path 2
 * Fireball: 130 XP
 * Wall of Fire: 700 XP
 * Dragon's Breath: 2,600 XP
 * Summon Phoenix: 13,000 XP
 * Wizard Lord Phoenix: 35,000 XP
 * Path 3
 * Intense Magic: 140 XP
 * Monkey Sense: 500 XP
 * Shimmer: 2,200 XP
 * Necromancer: Unpopped Army: 10,000 XP
 * Soulbind: 30,000 XP

Alchemist
 * Path 1
 * Larger Potions: 140
 * Acidic Mixture Dip: 550 XP
 * Berserker Brew: 2,250 XP
 * Stronger Stimulant: 10,000 XP
 * Permanent Brew: 30,000 XP
 * Path 2
 * Stronger Acid: 140 XP
 * Perishing Potions: 500 XP
 * Unstable Concoction: 2,500 XP
 * Transforming Tonic: 10,000 XP
 * Total Transformation: 28,000 XP
 * Path 3
 * Acid Pool: 145 XP
 * Faster Throwing: 700 XP
 * Lead to Gold: 2,000 XP
 * Rubber to Gold: 8,500 XP
 * Bloon Master Alchemist: 24,000 XP

Super Monkey
 * Path 1
 * Laser Blasts: 500 XP
 * Plasma Blasts: 2,200 XP
 * Sun Avatar: 7,000 XP
 * Sun Temple: 50,000 XP
 * True Sun God: 150,000 XP
 * Path 2
 * Super Range: 300 XP
 * Epic Range: 1,300 XP
 * Robo Monkey: 6,000 XP
 * Tech Terror: 35,000 XP
 * The Anti-Bloon: 85,000 XP
 * Path 3
 * Knockback: 550 XP
 * Ultravision: 2,000 XP
 * Dark Knight: 6,500 XP
 * Dark Champion: 47,500 XP
 * Legend of the Night: 100,000 XP

Druid
 * Path 1
 * Hard Thorns: 150 XP
 * Heart of Thunder: 750 XP
 * Druid of the Storm: 2,500 XP
 * Ball Lightning: 12,000 XP
 * Superstorm: 35,000 XP
 * Path 2
 * Thorn Swarm: 140 XP
 * Heart of Oak: 600 XP
 * Druid of the Jungle: 2,000 XP
 * Jungle's Bounty: 11,000 XP
 * Spirit of the Forest: 40,000 XP
 * Path 3
 * Druidic Reach: 120 XP
 * Heart of Vengeance: 550 XP
 * Druid of Wrath: 1,700 XP
 * Poplust: 14,000 XP
 * Avatar of Wrath: 33,000 XP

Spike Factory
 * Path 1
 * Bigger Stacks: 170 XP
 * White Hot Spikes: 600 XP
 * Spiked Balls: 2,400 XP
 * Spiked Mines: 15,000 XP
 * Super Mines: 32,500 XP
 * Path 2
 * Faster Production: 180 XP
 * Even Faster Production: 650 XP
 * MOAB Shredr: 2,500 XP
 * Spike Storm: 11,000 XP
 * Carpet of Spikes: 35,000 XP
 * Path 3
 * Long Reach: 120 XP
 * Directed Spikes: 550 XP
 * Long Life Spikes: 2,100 XP
 * Deadly Spikes: 9,000 XP
 * Perma-Spike: 29,500 XP

Banana Farm
 * Path 1
 * Increased Production: 200 XP
 * Greater Production: 750 XP
 * Banana Plantation: 3,000 XP
 * Banana Research Facility: 20,000 XP
 * Banana Central: 50,000 XP
 * Path 2
 * Long Life Bananas: 200 XP
 * Valuable Bananas: 1,000 XP
 * Monkey Bank: 3,500 XP
 * IMF Loan: 20,000 XP
 * Monkey-Nomics: 50,000 XP
 * Path 3
 * EZ Collect: 200 XP
 * Banana Salvage: 950 XP
 * Marketplace: 3,200 XP
 * Central Market: 20,000 XP
 * Monkey Wall Street: 50,000 XP

Monkey Village
 * Path 1
 * Bigger Radius: 160 XP
 * Jungle Drums: 1,000 XP
 * Primary Training: 2,000 XP
 * Primary Mentoring: 12,000 XP
 * Primary Expertise: 32,000 XP
 * Path 2
 * Grow Blocker: 150 XP
 * Radar Scanner: 2,500 XP
 * Monkey Intelligence Bureau: 3,500 XP
 * Call To Arms: 20,000 XP
 * Homeland Defense: 30,000 XP
 * Path 3
 * Monkey Business: 250 XP
 * Monkey Commerce: 750 XP
 * Monkey Town: 3,000 XP
 * Monkey City: 15,500 XP
 * Monkeyopolis: 28,000 XP