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