Here is the full list of all 10 GUNPIG: Firepower For Hire achievements.
Make one full run.
Tried every gun in the game.
Collected all the art cards.
Destroyed 20 crates.
Made it through the first 4 levels.
Clear any level of all enemies.
Watch the end credits ’til the end!
Finish a level by only killing the end boss.
Finish the game using only the CHRY-001 weapon.
Destroy 50 enemies using sub-weapons (drop-bomb, burn barrier or flash blast).