Full list of all 46 Slay The Spire achievements worth 1,070 gamerscore. It takes around 150-200 hours to unlock all of the achievements in the base game.
The base game contains 44 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 2 achievements worth 70 Gamerscore.
Complete Ascension Level 10.
Win a combat without playing an Attack.
Defeat 3 enemies with Poison in a single combat.
Complete the Ending with the Ironclad.
Complete the Ending with the Defect.
Have 10 or more buffs during combat.
Play 25 cards in a single turn.
Have 9 Energy during a single turn of combat.
Beat the game with the Defect.
Defeated Donu & Deca.
Have 99 or more Block during combat.
Defeated the Bronze Automaton.
Beat the game with the Ironclad.
Defeated the Time Eater.
Defeat a boss without taking any damage.
Beat the game with the Silent.
Defeated the Awakened One.
Defeated the Champ.
Defeated the Collector.
Exhaust 20 cards in a single combat.
Unlock Ascension mode.
Win a Daily Climb.
Win a battle with 1 HP remaining.
Defeated the Slime Boss.
Defeated Hexaghost.
Defeated the Guardian.
Complete Ascension Level 20.
Beat the game with a deck containing no uncommons or rares.
Beat the game with a single relic.
Have 25 or more Focus during combat.
Channel 9 Plasma in a single turn.
Complete the Ending with the Ironclad, Silent, and Defect.
Beat the game with a 5 card deck or smaller.
Complete the Ending with the Silent.
Defeat the Transient before it fades away.
Beat the game in under 20 minutes.
Finish Donu with a Feed.
Defeat a boss on turn 1.
Have 999 Block during combat.
Play 10 Shivs in a single turn.
Have 50 or more Strength during combat.
Have 3 or fewer cards in hand, draw, and discard pile combined.
Apply 99 or more Poison on a single enemy.
Obtain all other Achievements
Beat the game with the Watcher
Complete the Ending with the Watcher