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