Here is the full list of all 40 Tainted Grail: Conquest achievements.
Use 3 items in one turn.
Win a fight in one turn.
Recruit the Seamstress
Win a run without using Healing Potions in combat.
Slay the Third Guardian
Reach level 20 with the Pathfinder
Kill 3 Treasure Guardians in a single run.
Recruit the Master-At-Arms
Light a wyrdcandle to an Ultra level in combat.
Recruit the Candlemaker
Slay the Second Guardian
Win a fight having less than 5% HP.
Slay the First Guardian
Recruit the Scientist
Upgrade a Quest Card
Die and immediately start a new run.
Spend all Energy without dealing any damage 3 turns in a row.
Recruit the Blacksmith
Kill your first Treasure Guardian
Win the fight in the tutorial.
Reach level 20 with the Summoner
Reach level 20 with the Necromancer
Reach level 20 with the Blood Mage
Reach level 20 with the Wyrdhunter
Reach level 20 with the Berserker
Reach level 20 with the Sentinel
Reach level 20 with the Zealot
Reach level 20 with the Apostate
Recruit the Ghost
Recruit the Bard
Find your furry companion
Reach any place at the leaderboard.
Draw your entire deck in one turn.
Play your entire deck in one turn.
Stun an enemy that intends to attack you with 10 or more Hits.
Get enemy's Armor to -500.
Deal more than 3000 damage in a single Hit.
Finish a run fighting in less than 15 combat encounters.
Use 10 items in a single combat.
Win a run with 8 or less cards in your deck.