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