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