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