| Unlockable: | How to unlock: |
| ...and Practice. | Build a Workshop. |
| A Continental Fellow | Win the game from each of the 5 starting locations. |
| Ain't No Cavalry Comin' | Have a soldier survive every mission in a full game. |
| All Aboard | Complete Confounding Light with more than 3 turns left on the timer. |
| All Employees Must Wash Hands… | In a single game, complete every Autopsy. |
| All Together Now | Get satellite coverage over every country on one continent. |
| And Hell's Coming With Me | Successfully assault an Overseer UFO. |
| And So It Begins… | Complete the tutorial mission. |
| Angel of Death | Kill an alien while flying. Single player only. |
| As A Scalpel | Earn the "Excellent" rating in every performance category on a terror mission. |
| Bada Boom | Kill 50 aliens with explosive weapons. |
| Bait the Hook | Complete Confounding Light. |
| Beyond the Veil | Find a soldier with the Gift. |
| Bubonic | Play a multiplayer match against someone with this achievement. |
| Combat Ready | Build an item. |
| Disaster Averted | Complete Deluge. |
| Drums in the Deep | Gain access to the lowest level in your base. |
| Earth First | Beat the game on Classic difficulty. |
| Edison | In a single game, complete every Research Project. |
| Eye in the Sky | Launch a Satellite. |
| Flight of the Valkyries | Win a mission with an all-female squad. Single player only. |
| Great Minds Think Alike | Complete Furies. |
| Happy to Oblige | Fulfill a Council request. |
| Humanity's Savior | Beat the game on any difficulty. |
| Hunter/Killer | In a single game, shoot down one of each alien craft. |
| Lone Wolf | Clear a UFO crash site with one soldier on Classic or Impossible difficulty. |
| Man No More | Build a suit of powered armor. |
| Meet New People. Then Kill Them. | Win a multiplayer match. |
| New Friend | Complete Friends in Low Places. |
| No Looking Back | Beat the game in Ironman mode on Classic or Impossible Difficulty. |
| No Sweat | Complete Deluge without activating more than 2 valves. |
| Off My Planet | Recover the Hyperwave Beacon. |
| On the Shoulders of Giants | Build the Gollop Chamber. |
| One Gun at a Time | Staff the Engineering Department with 80 engineers. |
| Oppenheimer | Staff the Research Labs with 80 scientists. |
| Our Finest Hour | Beat the game on Impossible difficulty. |
| Pale Horse | Kill 500 aliens. |
| Prisoner of War | Capture a live alien. |
| Ride the Lightning | Build a Firestorm. |
| Rising Dragon | Take your new ally into the final challenge. |
| Saved to Savior | Have your newest ally volunteer for the most difficult duty. |
| See All, Know All | Build the Hyperwave Relay. |
| Shooting Stars | Shoot down 40 UFOs. |
| Skunkworks | In a single game, complete every Foundry project. |
| Tables Turned | Shoot down a UFO. |
| The Bigger They Are | Complete Gangplank. |
| The Chase Is On | Complete Portent. |
| The Gatekeeper | Stun an Outsider. |
| The Hardest Road | Advance one of your soldiers to Colonel rank. |
| The Volunteer | Make contact with the Ethereal hive mind. |
| Theory... | Build a Laboratory. |
| Up and Running | Build a base facility. |
| We Happy Few | Complete a mission without losing a soldier. |
| Welcoming Committee | Kill 150 aliens. |
| Wet Work | Complete a Very Hard abduction mission in five turns or less on Classic or Impossible difficulty. |
| What Wonders Await | Complete a Research Project. |
| Worth Every Penny | Acquire 1000 credits in one month. |
| X Marks the Spot | Uncover the alien base's location. |
| Xavier | Mind Control an Ethereal. Single player only. |
| You Have 5 Seconds to Comply | Build a S.H.I.V. |
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