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