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