Here is the full list of all 33 OCTOPATH TRAVELER II achievements.
Obtained all battle-tested equipment.
Traveled to every location on the map.
Obtained all records.
Soothed or knocked 100 townspeople unconscious.
Returned dawn to the world.
Approached the end of your journey.
Completed Castti and Ochette's Crossed Path.
Completed Osvald and Partitio's Crossed Path.
Learned all EX skills.
Completed Ochette's story.
Completed Partitio's story.
Brought along four townspeople at once.
Completed Temenos and Throné's Crossed Path.
Completed Temenos's story.
Completed Agnea's story.
Completed Agnea and Hikari's Crossed Path.
Completed Throné's story.
Completed Castti's story.
Completed Osvald's story.
Learned all secondary jobs.
Completed Hikari's story.
Gathered all eight travelers.
Dealt 9,999 or more damage.
Learned a job's divine skill.
Rode the ferry to a new land.
Gleaned information from 100 townspeople.
Learned a skill for the first time.
Embarked on a journey.
Acted at maximum boost for the first time.
Broke an enemy for the first time in battle.
Unlocked all achievements.
Defeated the netherworldly threat.
Finished all side stories.