Installed weapons on all the tiles accessible on a level.
Completed a level without improving weaponry.
Used all the different types of geo-charge on a level.
Sold 10 weapons on a single level.
Installed all types of weapons accessible on a level.
Unlocked a tile for i-volve on any level.
Used geo-charges 10 times on a single level.
Completed a level with the time machine's health below 10 points.
Collected 10,000 bones in a single level.
Didn't let a single enemy reach the time machine throughout a level.
Destroyed 20,000 enemies throughout the entire game.