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