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