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