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