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