Here is the full list of all 37 Tree of Savior (English Ver.) achievements.
Destroyed equipment by enhancement
Added Socket to the Equipment
Tried to enhance equipment
Used Soul Crystal to ressurect
Purchased item from the Contents Point Shop
Repair item for the first time
Durability of the main weapon became 0
Added a Companion
Purchased item from the Mercenary Badge Shop
Achieved Enhance Skill attribute Lv.100
Sent a friend request
Ate food for the first time from the Refreshment Table
Gave Like to someone
Equip item in the body costume slot
Achieved first Adventure Journal point
Character became incapable of battle
Changed Haircut at Beauty Shop for the first time
Successfully changed character's gender for the first time
Transcended the equipment
Participated at Team Battle League
Acquired Nukella for the first time
Cleared Level Dungeon for the first time
Clear Lepidoptera Junction: Legend (Hard)
Clear White Witch's Forest: Legend (Hard)
Clear Assister Dungeon Stage 40
Obtain Vaivora weapon
Dismantle legend item
Breakthrough the cage of Skiaclipse
Draw Gem
Fail to enhance at +15 with an Anvil (Enhancing with silver, golden, ruby, and diamond anvil does not count)
Changed Class
Drew a Legend Assister Card
Fed the Cat in Klaipeda
Tried Offering
Obtained Arch Stone
Visit the Fedimian Public House
Sold an item at the market