When It Hits the Fan achievements

Kill 10,000 enemies

Defeat the lab zone boss

Kill the fourth boss with at least 3 slimes still alive on Normal mode or higher

Complete the Lab Zone without using a single continue on Normal mode or higher

Complete the City Zone without using a single continue on Normal mode or higher

Complete the Mothership Zone without using a single continue on Normal mode or higher

Get a 200 combo with only the shotgun

Complete the Hell Zone without using a single continue on Normal mode or higher

Complete the game from start to finish with Chainsaw Only mode active from the Secret Options menu on Normal mode or higher

Get a 100 combo with only the flamethrower

Complete the entire game without using a single continue on Normal mode or higher

Kill 2500 enemies with the shotgun