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