Complete each achievement to get the allotted gamerscore. The numbers between the () is the points given for each achievement.
| Achievement | How to unlock |
|---|
| Combat Ready(5) | Build an item. |
| Eye in the Sky(5) | Launch a Satellite. |
| Up and Running(5) | Build a base facility. |
| What Wonders Await(5) | Complete a Research Project. |
| ...and Practice(10) | Build a Workshop. |
| All Employees Must Wash Hands...(10) | In a single game, complete every Autopsy. |
| All Together Now(10) | Get satellite coverage over every country on one continent. |
| Bada Boom(10) | Kill 50 aliens with explosive weapons. |
| Drums in the Deep(10) | Gain access to the lowest level in your base. |
| Man No More(10) | Build a suit of powered armor. |
| Tables Turned(10) | Shoot down a UFO. |
| The Hardest Road(10) | Advance one of your soldiers to Colonel rank. |
| Theory...(10) | Build a Laboratory. |
| We Happy Few(10) | Complete a mission without losing a soldier. |
| Wet Work(10) | Complete a Very Hard abduction mission in five turns or less on Classic or Impossible difficulty. |
| You Have 5 Seconds to Comply(10) | Build a S.H.I.V. |
| And So It Begins...(15) | Complete the tutorial mission. |
| Happy to Oblige(15) | Fulfill a Council request. |
| Hunter/Killer(15) | In a single game, shoot down one of each alien craft. |
| Lone Wolf(20) | Clear a UFO crash site with one soldier on Classic or Impossible difficulty. |
| One Gun at a Time(20) | Staff the Engineering Department with 80 engineers |
| Oppenheimer(20) | Staff the Research Labs with 80 scientists. |
| Skunkworks(20) | In a single game, complete every Foundry project. |
| Welcoming Committee(20) | Kill 150 aliens. |
| Worth Every Penny(20) | Acquire 1000 credits in one month. |
| As A Scalpel(25) | Earn the "Excellent" rating in every performance category on a terror mission. |
| Edison(25) | In a single game, complete every Research Project. |
| Humanity's Savior(30) | Beat the game on any difficulty. |
| Shooting Stars(35) | Shoot down 40 UFOs. |
| A Continental Fellow(50) | Win the game from each of the 5 starting locations. |
| Ain't No Cavalry Comin'(50) | Have a soldier survive every mission in a full game. |
| Pale Horse(50) | Kill 500 aliens. |
| Earth First(60) | Beat the game on Classic difficulty. |
| Our Finest Hour(90) | Beat the game on Impossible difficulty. |
| No Looking Back(100) | Beat the game in Ironman mode on Classic or Impossible difficulty. |
| Secret Achievements | - |
| And Hell's Coming With Me(10) | Successfully assault an Overseer UFO |
| Angel of Death(10) | Kill an alien while flying. Single player only. |
| Beyond the Veil(10) | Find a soldier with the Gift. |
| Flight of the Valkyries(10) | Win a mission with an all-female squad. Single player only. |
| On the Shoulders of Giants(10) | Build the Gollop Chamber |
| Poison Control(10) | Cure poison on five soldiers in a single mission. Single player only. |
| Prisoner of War(10) | Capture a live alien. |
| Ride the Lightning(10) | Build a Firestorm. |
| See All, Know All(10) | Build the Hyperwave Relay. |
| The Gatekeeper(10) | Stun an Outsider. |
| The Volunteer(10) | Make contact with the Ethereal hive mind. |
| X Marks the Spot(10) | Uncover the alien base's location. |
| Xavier(10) | Mind Control an Ethereal. Single player only. |
| Meet New People. Then Kill Them.(25) | Win a multiplayer match. |
| Off My Planet(25) | Recover the Hyperwave Beacon. |
| DLC Achievements | DLC Achievements |
| Bait the Hook(10) | Complete Confounding Light. |
| New Friend(10) | Complete Friends in Low Places. |
| The Bigger They Are(20) | Complete Gangplank. |
| All Aboard(30) | Complete Confounding Light with more than 3 turns left on the timer. |
| Rising Dragon(30) | Take your new ally into the final challenge. |
