Apopalypse Now

 is an unlockable achievement in Bloons Tower Defense 4. It is achieved by reaching round 100 in Apopalypse Mode. It awards 50 upon completion.

Trivia

 * There are 2 Daily Challenges in BTD5 with the same name in Apopalypse Mode.
 * In BTD5 Mobile, one takes place in Monkey Lane, and one at Mount Magma
 * This is a reference to the 1979 film Apocalypse Now.