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