Full list of all 23 Destiny 2 achievements. It takes around 200 hours to unlock all of the achievements in the base game on Windows.
The base game contains 13 achievements, and there is 1 DLC pack containing 10 achievements.
Complete the Leviathan raid on Prestige difficulty.
Acquire each Titan subclass.
Acquire each Warlock subclass.
Complete the Leviathan raid.
Collect 15 Red War exotic weapons or armor.
Complete 30 challenges.
Encounter an Agent of the Nine somewhere in the system.
Complete Introduction: Crucible.
Complete a Flashpoint on Earth, Titan, Nessus, or Io.
Complete a Nightfall strike.
Acquire each Hunter subclass.
Reach level 20.
Complete a Heroic public event.
Complete the "Last Wish" Raid.
Complete a Triumph Seal.
Defeat a Forsaken Nightfall Boss.
Collect 10 Forsaken Exotic weapons or armor.
Complete a Collections Badge.
Complete a Forsaken Exotic Quest.
Pursue Uldren and the Fanatic to the Watchtower, and finish what you started.
Enter the Dreaming City.
Win a Gambit match.
Earn 5,000 Triumph points.