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