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.
Completed the IMC campaign
Completed all challenges for a single weapon
Finished as the top player on your team once
Survived an evacuation
Completed the Militia campaign
Called in your Titan 25 times
Created a custom titan loadout
Caught a projectile shot from a vortex with your own vortex
Created a custom pilot loadout
Completed training
Kill 5 enemies with one Arc Cannon shot
Kill 10 ejecting Pilots
Kill an ejecting Pilot with the Plasma Railgun
Earn 500 burn cards
Hack 20 Spectres using the Data Knife
Became a second generation Pilot
Win every Campaign level as an IMC pilot
Win every Campaign level as a Militia pilot
Kill 5 enemies by dropping a titan on them
Reach level 25
Reach level 50
Win 50 Capture The Flag matches
Win 50 Attrition matches
Win 50 Pilot Hunter matches
Win 50 Hardpoint matches
Win 50 Last Titan Standing matches
Play every gameplay mode on every map
Rodeo-kill a Titan
Snap the necks of 10 Pilots
Unlock everything
Play 50 Campaign matches
Kill all pilots during the evacuation single-handedly
Wallrun for 5 kilometers
Reach the highest Pilot generation
Kill 1000 AI soldiers
Win a match on Swampland
Play every game mode on Swampland
Don't touch the ground for 60 seconds on Swampland
Be airborne for 500 Meters on Swampland
Win a match on Runoff
Play every game mode on Runoff
Kill 25 enemies while wall running on Runoff
Kill 200 enemies on Runoff
Win a match on War Games
Play every game mode on War Games
Kill 12 Pilots in a single match on War Games
Kill 100 Pilots on War Games
Win a match on Haven
Play every game mode on Haven
Execute 2 titans in a single match on Haven
Kill 15 titans while you have a Titan Burncard active on Haven
Win a match on Export
Play every game mode on Export
Kill an enemy with the trap on Export
Kill 25 enemies while cloaked on Export
Win a match on Dig Site
Play every game mode on Dig Site
Kill 12 pilots in a single match on Dig Site
Kill 50 Pilots on Dig Site
Win a match on Backwater
Play every game mode on Backwater
Kill an enemy with AMPed vortex shield deflection on Backwater
Melee kill 15 enemies while cloaked on Backwater
Win a match on Sand Trap
Play every game mode on Sand Trap
Kill 10 Pilots while Active Radar Pulse is active on Sandtrap
Kill 2 Titans as a Pilot in a single match on Sandtrap
Win a match on Zone 18
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
Earn 500,000 Black Market Credits
Purchase 100 items from the Black Market
Discard 100 Burncards in exchange for Black Market Credits
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
Rename a custom loadout
Unlock 50 Titan Insignias
Use 5 Titan Burncards
Earn 3 stars for a single map and mode
Earn a total of 50 Stars
Achieve a 5 game winstreak
Achieve a 10 game winstreak
Play a ranked match
Earn 50 Battlemarks in Ranked Play
Earn Gen 10 without using a Forged Certification on a regen challenge