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.
Complete every Side Quest.
Collect every Mask.
Say the perfect words in every Relationship.
Catch every Herptile.
Collect every Feather.
Catch every Fish.
Light every beacon.
Conquer every Fortress.
View every Lookout Point.
Finish the Main Quest.
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.