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