Full list of all 88 Titanfall achievements worth 2,000 gamerscore. It takes around 150-200 hours to unlock all of the achievements in the base game on Xbox One.
The base game contains 35 achievements worth 1,000 Gamerscore, and there are 4 DLC packs containing 53 achievements worth 1,000 Gamerscore.
Snapped the necks of 10 Pilots
Won 50 Hardpoint matches
Earned 500 burn cards
Survived an evacuation
Won every Campaign level as an IMC pilot
Completed all challenges for a single weapon
Won 50 Attrition matches
Wallran for 5 kilometers
Killed 5 enemies by dropping a titan on them
Became a second generation Pilot
Reached level 50
Killed 10 ejecting Pilots
Played 50 Campaign matches
Hacked 20 Spectres using the Data Knife
Killed 1000 AI soldiers
Completed the IMC campaign
Won every Campaign level as a Militia pilot
Reached level 25
Killed 5 enemies with one Arc Cannon shot
Completed the Militia campaign
Called in your Titan 25 times
Rodeo-killed a Titan
Created a custom titan loadout
Created a custom pilot loadout
Caught a projectile shot from a vortex with your own vortex
Finished as the top player on your team once
Completed training
Kill an ejecting Pilot with the Plasma Railgun
Win 50 Capture The Flag matches
Win 50 Pilot Hunter matches
Win 50 Last Titan Standing matches
Play every gameplay mode on every map
Unlock everything
Kill all pilots during the evacuation single-handedly
Reach the highest Pilot generation
Won a match on Swampland
Killed 12 Pilots in a single match on War Games
Won a match on War Games
Was airborne for 500 Meters on Swampland
Didn't touch the ground for 60 seconds on Swampland
Won a match on Runoff
Play every game mode on Swampland
Play every game mode on Runoff
Kill 25 enemies while wall running on Runoff
Kill 200 enemies on Runoff
Play every game mode on War Games
Kill 100 Pilots on War Games
Killed an enemy with the trap on Export
Won a match on Export
Killed 15 titans while you had a Titan Burncard active on Haven
Won a match on Haven
Killed 12 pilots in a single match on Dig Site
Won a match on Dig Site
Play every game mode on Haven
Execute 2 titans in a single match on Haven
Play every game mode on Export
Kill 25 enemies while cloaked on Export
Play every game mode on Dig Site
Kill 50 Pilots on Dig Site
Killed an enemy with AMPed vortex shield deflection on Backwater
Won a match on Backwater
Won a match on Zone 18
Killed 2 Titans as a Pilot in a single match on Sandtrap
Won a match on Sand Trap
Play every game mode on Backwater
Melee kill 15 enemies while cloaked on Backwater
Play every game mode on Sand Trap
Kill 10 Pilots while Active Radar Pulse is active on Sandtrap
Play every game mode on Zone 18
Kill 10 Pilots while stim is active on Zone 18
Kill 10 Pilots as a Titan in a single match on Zone 18
Earned at least 2 stars on 15 different maps in Frontier Defense
Purchased all Titan OS Voice Packs
Used 5 Titan Burncards
Earned a total of 50 Stars
Unlocked 50 Titan Insignias
Earned 50 Battlemarks in Ranked Play
Discarded 100 Burncards in exchange for Black Market Credits
Got a 10 game winstreak
Played a ranked match
Completed all Daily Challenges for a day
Renamed a custom loadout
Earned 3 stars for a single map and mode
Got a 5 game winstreak
Earn 500,000 Black Market Credits
Purchase 100 items from the Black Market
Complete 100 Daily Challenges
Earn Gen 10 without using a Forged Certification on a regen challenge