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