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