Full list of all 20 Open World Game: the Open World Game achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
100% Completion + 1%.
Read every Journal Entry.
Collect everything.
Reforge every Legendary Weapon.
Catch every Fish.
Light every beacon.
View every Lookout Point.
Complete every Side Quest.
Collect every Mask.
Catch every Herptile.
Collect every Feather.
Say the perfect words in every Relationship.
Finish the Main Quest.
Conquer every Fortress.
Visit every Fast Travel location.
Reach Lv 100.
Finish the Completionist Skill Tree.
Unlock every Skill.
Finish the Speed-Runner Skill Tree.
Finish the Generalist Skill Tree.