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