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