Full list of all 46 Slay the Spire achievements. It takes around 60-80 hours to unlock all of the achievements in the base game on Windows.
The base game contains 26 achievements, and there are 8 DLC packs containing 20 achievements.
Play 25 cards in a single turn.
Have 50 or more Strength during combat.
Have 3 or fewer cards in hand, draw, and discard pile combined.
Play 10 Shivs in a single turn.
Have 10 or more buffs during combat.
Beat the game with the Silent.
Defeated the Time Eater.
Have 99 or more Block during combat.
Defeated the Bronze Automaton.
Win a combat without playing an Attack.
Defeated Donu & Deca.
Defeated the Collector.
Defeat 3 enemies with Poison in a single combat.
Apply 99 or more Poison on a single enemy.
Exhaust 20 cards in a single combat.
Defeat a boss without taking any damage.
Defeated the Slime Boss.
Win a battle with 1 HP remaining.
Defeated Hexaghost.
Beat the game with the Ironclad.
Defeated the Awakened One.
Have 9 Energy during a single combat.
Defeated the Champ.
Defeated the Guardian.
Have 999 Block during combat.
Defeat a boss in a single turn.
Obtain all other Achievements.
Complete Ascension Level 10.
Beat the game with a single relic.
Unlock Ascension mode.
Beat the game in under 20 minutes.
Beat the game with a 5 card deck or smaller.
Finish Donu with a Feed.
Beat the game with the Defect.
Beat the game with a deck of only common cards.
Have 25 or more Focus during combat.
Win a Daily Climb.
Channel 9 Plasma in a single turn.
Defeat the Transient before it fades away.
Complete Ascension Level 20.
Beat the game with the Watcher.
Complete the Ending with the Watcher.