Achievements earnable without fully playing

[Thomas]

This has already been reported.

[0.7.0.1] Unpoppable achievement can be obtained by joining end of game (+ King of "___")

You can earn the unpoppable achievement by joining a ball race server at the very end of the game. Not sure if this can be done at the end of any round or just at the end of the game, but you can bypass actually playing the level and just win it this way. You can also win “King of ___” by joining at the end of the game.