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