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