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