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