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 50 levels with only one Soda Junkie.
Complete dungeon level 750.
Complete dungeon level 1000.
Find a legendary item.
Complete 100% of the bestiary.
Purchase all basic sodas.
Reflect 100 damage from a single attack.
Enter a battle in the Arena.
Complete dungeon level 500.
Complete dungeon level 250.
Find a rare item.
Have one Knight defend for another Knight.
Hope you're hungry.
Sell 100 items.
Complete 100 levels in one trip.
Complete dungeon level 100.
Inflict burn, sleep, poison, and confusion on one enemy.
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.