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