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