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