Here is the full list of all 24 Soda Dungeon achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Inflict burn, sleep, poison, and confusion on one enemy.
Complete 100% of the bestiary.
Find a legendary item.
Win a battle by only defending.
Steal essence from an enemy.
Complete dungeon level 1000.
Complete dungeon level 750.
Purchase all basic sodas.
Hope you're hungry.
Complete dungeon level 500.
Complete 50 levels with only one Soda Junkie.
Find a rare item.
Have one Knight defend for another Knight.
Reflect 100 damage from a single attack.
Sell 100 items.
Complete dungeon level 250.
Complete 100 levels in one trip.
Enter a battle in the Arena.
Complete dungeon level 100.
Complete 50% of the bestiary.
Slay 500 enemies.
Slay 10 bosses.
Discover and explore an alternate path in the dungeon.
Complete your first dungeon trip.