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