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