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.
Complete the Leviathan raid.
Acquire each Hunter subclass.
Acquire each Titan subclass.
Complete 30 challenges.
Collect 15 Red War exotic weapons or armor.
Complete a Flashpoint on Earth, Titan, Nessus, or Io.
Acquire each Warlock subclass.
Complete a Nightfall strike.
Reach level 20.
Complete Introduction: Crucible.
Complete a Heroic public event.
Encounter an Agent of the Nine somewhere in the system.
Complete a Triumph Seal.
Complete the "Last Wish" Raid.
Complete a Collections Badge.
Collect 10 Forsaken Exotic weapons or armor.
Complete a Forsaken Exotic Quest.
Defeat a Forsaken Nightfall Boss.
Earn 5,000 Triumph points.
Enter the Dreaming City.
Win a Gambit match.
Pursue Uldren and the Fanatic to the Watchtower, and finish what you started.