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 360.
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 Pilot Hunter matches
Won 50 Last Titan Standing matches
Killed an ejecting Pilot with the Plasma Railgun
Killed all Pilots during the evacuation single-handedly
Killed 10 ejecting Pilots
Won 50 Hardpoint matches
Wallran for 5 kilometers
Unlocked everything
Played 50 Campaign matches
Earned 500 burn cards
Snapped the necks of 10 Pilots
Won 50 Attrition matches
Became a second generation Pilot
Reached level 50
Hacked 20 Spectres using the Data Knife
Won every Campaign level as an IMC Pilot
Won every Campaign level as a Militia Pilot
Killed 1000 AI soldiers
Survived an evacuation
Killed 5 enemies with one Arc Cannon shot
Killed 5 enemies by dropping a Titan on them
Completed the Militia campaign
Reached level 25
Completed all challenges for a single weapon
Called in your Titan 25 times
Finished as the top player on your team once
Completed the IMC campaign
Created a custom Titan loadout
Rodeo-killed a Titan
Caught a projectile shot from a vortex with your own vortex
Created a custom Pilot loadout
Completed training
Win 50 Capture The Flag matches
Play every gameplay mode on every map
Reach the highest Pilot generation
Killed 200 enemies on Runoff
Killed 12 Pilots in a single match on War Games
Won a match on War Games
Was airborne for 500 Meters on Swampland
Won a match on Swampland
Didn't touch the ground for 60 seconds on Swampland
Killed 25 enemies while wall running on Runoff
Won a match on Runoff
Play every game mode on Swampland
Play every game mode on Runoff
Play every game mode on War Games
Kill 100 Pilots on War Games
Killed 25 enemies while cloaked on Export
Killed 15 titans while you had a Titan Burncard active on Haven
Won a match on Dig Site
Killed an enemy with the trap on Export
Executed 2 titans in a single match on Haven
Won a match on Haven
Won a match on Export
Play every game mode on Haven
Play every game mode on Export
Play every game mode on Dig Site
Kill 12 pilots in a single match on Dig Site
Kill 50 Pilots on Dig Site
Played every game mode on Sand Trap
Killed an enemy with Amped vortex shield deflection on Backwater
Won a match on Sand Trap
Won a match on Backwater
Killed 10 Pilots while Active Radar Pulse was active on Sand Trap
Killed 2 Titans as a Pilot in a single match on Sand Trap
Killed 10 Pilots while stim was active on Zone 18
Killed 10 Pilots as a Titan in a single match on Zone 18
Won a match on Zone 18
Melee killed 15 enemies while cloaked on Backwater
Play every game mode on Backwater
Play every game mode on Zone 18
Purchased 100 items from the Black Market
Purchase all Titan OS Voice Packs
Earned 50 Battlemarks in Ranked Play
Unlocked 50 Titan Insignias
Earned a total of 50 Stars
Used 5 Titan Burncards
Won 10 games in a row
Won 5 games in a row
Played a ranked match
Discard 100 Burncards in exchange for Black Market Credits
Completed all Daily Challenges for a day
Earned 3 stars for a single map and mode
Named a custom loadout
Earn 500,000 Black Market Credits
Complete 100 Daily Challenges
Earn at least 2 stars on 15 different maps in Frontier Defense
Earn Gen 10 without using a Forged Certification on a regen challenge