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