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