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