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.
Find a legendary item.
Complete 100% of the bestiary.
Find a rare item.
Win a battle by only defending.
Complete dungeon level 1000.
Reflect 100 damage from a single attack.
Complete dungeon level 750.
Steal essence from an enemy.
Sell 100 items.
Complete dungeon level 500.
Complete 50 levels with only one Soda Junkie.
Complete dungeon level 250.
Have one Knight defend for another Knight.
Slay 500 enemies.
Complete 100 levels in one trip.
Complete dungeon level 100.
Complete 50% of the bestiary.
Hope you're hungry.
Slay 10 bosses.
Enter a battle in the Arena.
Purchase all basic sodas.
Discover and explore an alternate path in the dungeon.
Complete your first dungeon trip.