Here is the full list of all 17 Super Grave Snatchers achievements.
Beat wave 35 on Necropolis
Ya keep dyin on me man
Beat the campaign on satanic mode
Beat the game on tough mode
Complete the secret ritual
Beat the campaign on any difficulty
Keep your soul beyond level one
Destroy everything in the sandbox level
Have 25 skeletons at the same time
Defeat the eternal tree
Listen to a friend's problems with no judgement
Defend the Supercrypt in Campaign
Die so hard that you break reality
Bring back your family early
Play the game once.. I'm SO SO proud of you!