Here is the full list of all 17 SturmFront - there are The Mutant War: Ubel Edition achievements worth 1,000 gamerscore.
Kill the first boss.
Kill the second boss.
Kill the third boss.
Kill the fourth boss.
Kill the fifth boss.
Beat the game.
Find the secret room.
Beat the game from stage 1 without death.
Beat the game from stage 1 (Hard Mode).
Find all the skull souls.
Destroy every Siegfried clone in Stage 0.
Walk backwards while looking forward for 10 seconds.
Try every weapon in the game.
Destroy 100 flesh tunnels with your flamethrower
Kill 500 enemies.
Kill 1000 enemies.
Kill 2000 enemies.