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