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