Here is the full list of all 14 198X achievements.
Complete Shadowplay without taking damage
Watch the end credits all the way through - thank you backers!
Complete the Kill Screen maze using only super effective attacks
Reach level MAX in Kill Screen
Collect all power-ups in Shadowplay
Complete The Runaway without a single collision
Destroy every enemy in Out of the Void without losing a life
Complete Beating Heart without dying or using pick-ups
Complete 198X
Complete Kill Screen
Complete Shadowplay
Complete The Runaway
Complete Out of the Void
Complete Beating Heart