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