Here is the full list of all 11 SPIRITUS achievements.
You always remember your first kill.
Take a monster's head clean off!
Start a new game
Sometimes death is inevitable...
Survived the horde and reached the lab!
Defeat the first boss.
Survive the subway and board the train
Reach the finale.
Equipped to deal with the worst.
You can decimate everything now.
Find the secret plans.