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