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