Here is the full list of all 54 Dragon's Dogma 2 achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
Defeated the gigantus in a short span of time.
Acquired every maister's teaching.
Boarded the phantom oxcart.
Experienced the end of the cycle.
Obtained Dragon's Dogma.
Led the people to safety in the unmoored world.
Overcame all the trials of the unmoored world.
Helped the gigantus walk again.
Witnessed the unmoored world.
Became Sovran of Vernworth.
Petrified a medusa.
Witnessed a brawl break out in your dwelling among your admirers.
Earned the affections of 50 people.
Accomplished a miracle for several people all at once.
Acquired a preserved medusa head.
Reclaimed your items from the scavenger who stole them from you.
Attended a palace masquerade in formal raiment.
Used illicit means to pass through the gate at the border.
Collected 80 Seeker's Tokens.
Decapitated a medusa.
Summoned a harpy, grabbed hold, and took flight.
Grilled every type of meat during the night and day.
Defeated the headless horseman.
Restored the dead to life at a morgue or charnel house.
Changed your vocation to warfarer.
Changed your vocation to magick archer.
Raised a person's affinity to the maximum.
Strengthened a weapon in wyrmfire.
Soaked in the hot spring.
Reached Drabnir's Grotto.
Discovered 50 dungeons.
Found a solution to every conundrum posed by the goddess of riddles.
Changed your vocation to mystic spearhand.
Returned to Agamen Volcanic Island.
Changed your vocation to trickster.
Changed your vocation.
Acquired a pawn badge.
Reached Dragonsbreath Tower.
Crossed a cyclopean bridge.
Passed through the gate at the border.
Set a pawn quest.
Took flight on griffin wing a second time.
Reached the maximum rank in a vocation.
Entered the rose chateau.
Revived two pawns simultaneously.
Purchased a dwelling of your own.
Used a Ferrystone.
Used a Wakestone to restore the dead to life.
Taught your pawn a specialization.
Boarded an oxcart.
Arrived in Vernworth.
Went camping.
Regained your memories of receiving the Arisen's charge.
Escaped the bonds of slavery.