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