Here is the full list of all 35 One Step From Eden achievements.
Get a Calamity spell
Defeat tier 4 Shiso
Defeat tier 4 Saffron
Execute Terrable
Win a boss fight with 1 HP
Defeat tier 4 Gunner
Defeat tier 4 Violette
Kill a hostage with the Devour spell
Defeat tier 4 Selicy
Spare Terrable
Defeat tier 4 Terra
Reach the Gate
Defeat tier 4 Reva
Defeat tier 4 Hazel
Cast 10 Jams in one battle
Beat the game without taking any spells
Have over 9,999 Shield
Beat Hell Mode 14
Have a spell from every Focus in your deck
Cover the entire field in flames
Beat the game with every character
Have over 200 cardtridges in your deck
Kill the last enemy with the Fadeaway spell
Beat the game without collecting any Artifacts
Win a battle without using a Spell or Weapon
Have 0 Max Mana
Have 8 pacts at the same time
Destroy a Self Defense hazard
Upgrade the same spell 4 times
Have 1 Spell in your deck
Have at least 16 broken tiles at the same time
Kill Gunner or Shiso with a Slashfik spell
Defeat tier 4 Shopkeeper
Beat Serif and get sent back
Execute Serif