Full list of all 32 Super Time Force achievements worth 1,375 gamerscore. It takes around 12-15 hours to unlock all of the achievements in the base game.
The base game contains 27 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 5 achievements worth 375 Gamerscore.
Complete a... clean... run of any level using only Squirty Harry
Beat any level using only Shieldy Blockerson
Get all Glorb Badges that existed before the game-shattering event knows as the Ultra Update
Achieve your first STF rank on any level
Use Jef's highly explosive rocket launcher to explode 15 enemies on a single level
Complete a Medieval level using only Lou Don Jim
Defeat Dr. Infinity
Get the Shard Badges in all regular, non-bossy levels
Complete the Future City time zone
Complete the Medieval time zone
Complete the Ancient Atlantis time zone
Complete the Prehistoric time zone
Fire 7 different charged attacks in a single level
Complete the Post-Apocalypse time zone
Prevent the death of 50 members of the Super Time Force
Complete any level using at least 6 different members of the Super Time Force
Kill any enemy by bouncing on it's head, plumber-style
Complete any level with 30 seconds remaining on the clock
Fire 5000 rounds with Jean Rambois' machine gun
Complete the 198X time zone
Get your first Glorb Badge in a time zone level
Get your first Shard badge
Kill 3 enemies with a single Charged shot from Aimy McKillin
Die within 3 seconds of spawning
Complete any level without leaving any saveable team members behind
Add a new team member to the Super Time Force
This one's totally a secret but you'll know it when you see it so hustle and look sharp
Complete 5 HellaDeck levels
Complete all HellaDeck Levels
Complete Super Hardcore Mode
Collect all Glorbs in the game
Shatter or collect all Shards in the game