Here is the full list of all 35 Void Tyrant achievements.
Clear one location as a knight.
Clear one location as a priest.
Clear one location as a duelist.
Clear one location as an assassin.
Beat any boss.
Kill 25 enemies.
Unlock the shop, the cafe, and the archive.
Unlock the basic starting boots, gloves, and jacket for the knight, duelist, priest, and assassin classes.
Purchase 10 items from traveling merchants.
Successfully disarm or evade 10 traps.
Use a meditation rug to destroy a hand card in your deck.
Win a round with your attack gauge at 7 or more above your opponent's attack gauge.
Receive 3 mystery packs after a run.
Finish 10 missions.
Beat 100 enemies.
Gather a total of 10.000 Guldins (Guldins count even when spent)
Unlock all town upgrades available from shop level 1-3.
Purchase 25 items from traveling merchants.
Upgrade a skill card to level 3.
Beat 2 bosses from side routes in a single run.
Disarm or evade 25 traps.
Beat 500 enemies.
Complete the game as knight, priest, duelist, and assassin.
Return all 6 crystals.
Purchase 100 items from traveling merchants.
Successfully disarm or evade 100 traps.
Wear level 3 clothes in all slots (boots, jacket, gloves), and hold a level 3 weapon, all at the same time.
Travel 100 steps in a single run.
Complete the game with 3 followers in your party.
Don't make a deal with the Groigl robber.
Defeat an enemy before they've even played a dealer card.
Face the final boss with a hero of level 7.
Learn 3 curses in a single run.
Yield 11 or more strikes at once.
Face an enemy who is burning, poisoned, and frozen at the same time.