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.
Complete every Side Quest.
View every Lookout Point.
Say the perfect words in every Relationship.
Collect every Mask.
Light every beacon.
Catch every Herptile.
Conquer every Fortress.
Collect every Feather.
Finish the Main Quest.
Visit every Fast Travel location.
Reach Lv 100.
Finish the Generalist Skill Tree.
Unlock every Skill.
Finish the Speed-Runner Skill Tree.
Finish the Completionist Skill Tree.