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