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