Here is the full list of all 35 Disc Room achievements.
DEFEAT THE ULTIMATE GATEKEEPER USING EVERY ABILITY
SURVIVE 20 SECONDS IN EVERY ROOM
EXPLORE ALL ???? ROOMS
COMPLETE HARD MODE
SURVIVE 10 SECONDS IN EVERY HARD ROOM
EXPLORE ALL HARD ROOMS
DIE FROM 4 DIFFERENT DISCS IN ONE LIFE
HOLD DOWN FFW FOR 10 SECONDS STRAIGHT
UNCOVER THE GOLDEN MYSTERY
DIE FROM ALL DISCS
EXPLORE ALL ROOMS
DISCOVER THE FOURTH GOLDEN ROOM
DIE FROM ALL DISCS IN ONE ZONE
UNLOCK ALL 6 ABILITIES
SURVIVE 20 SECONDS IN EVERY ROOM IN ONE ZONE
QUIT TO MAIN MENU WITHIN 2 SECONDS AFTER DYING
SURVIVE 20 SECONDS IN ANY HARD ROOM
SURVIVE 60 SECONDS IN ANY ROOM
FEED ???? 4 ????
DEFEAT AND REVIVE AN ANTIBODY
WALK 10K STEPS
START HARD MODE
FOLLOW THE PATH
DEFEAT THE ULTIMATE GATEKEEPER
???? THE ????
DISCOVER THE THIRD GOLDEN ROOM
DEFEAT THE CARNIVOROUS GATEKEEPER
FACE THE GOLDEN CARCASS
DISCOVER THE SECOND GOLDEN ROOM
DEFEAT THE PHANTOM GATEKEEPER
DISCOVER THE FIRST GOLDEN ROOM
DEFEAT THE OVERGROWN GATEKEEPER
SURVIVE 0 SECONDS OR LESS
END A RUN FROM THE MAP
DEFEAT THE ARMORED GATEKEEPER