Here is the full list of all 20 TAVERN GUARDIANS: BANQUET achievements.
Defeat your first enemy.
Clear 100 stages.
Stun enemies by dropping them 3 or more spaces 50 times.
Earn a total of 50000 Coins.
Use a self-destructing monster to kill a boss.
Expose hidden enemies 50 times.
Hit a boss with an empty bottle.
Have 10 blessed resources on the same board.
Use all items in the game.
Buy all gear in Story Mode.
Buy all gear in the game.
Defeat 30 thieves.
Open 50 treasure chests.
Earn a 10-hit combo.
Kill a boss while guardian's HP is in the 'Danger!' zone.
Kill the Wine Walker.
Kill the Hieracosphinx.
Kill King Mug.
Clear Story Mode on Hard.
Earn all achievements.