Full list of all 41 The Bureau: XCOM Declassified achievements. It takes around 25-30 hours to unlock all of the achievements in the base game on Windows.
The base game contains 34 achievements, and there is 1 DLC pack containing 7 achievements.
Customize an agent
Get 20 Headshot kills with any gun within a single campaign
Escaped Groom Range
Take an agent of every class into the field within a single campaign
Get an agent of each class to Rank 5 within a single campaign
Complete your first Dispatch Mission
Complete your first Minor Operation
Complete all Investigations in the base within a single campaign
Complete the game without a single agent bleeding out
Complete 6 Dispatch Missions within a single campaign
Complete 6 Minor Operations within a single campaign
Defeat a Muton
Defeat a Sectopod
Defeat a Titan
Complete an entire Operation without the player firing a weapon or using a grenade
Beat the game on Commander difficulty without ever changing it
Attach 10 Sticky Grenades onto Outsider enemies within a single campaign
Retrieve and escape with information on the enemy base
Confront the Outsider Leader
Closure
Now, it's time to end this
Infiltrated the Outsider Tower
Secured the package
Finish off 20 aliens using melee attacks within a single campaign
Reach Rank 10
Reach Rank 5
Use all of the agent and player abilities in the field within a single campaign
Perform 15 unique scans within a single campaign
Take down 20 Outsider Shields using laser-based guns within a single campaign
Give 150 commands to agents while in Battle Focus within a single campaign
Strip all of the armor off of 5 Mutons before killing them within a single campaign
Defeat all the Outsiders before escaping on the Skyranger
Have Mind Controlled enemies get a total of 15 kills within a single campaign
Get 40 kills on Flanked enemies within a single campaign
Complete the first trial in Hangar 01
Trigger the Invasion in Hangar 6
Defeat the Hangar 6 R&D Invaders
Destroy 60 enemies with DaSilva's Demo Charges within a single Hangar 6 R&D campaign
Beat Hangar 6 R&D without firing any alien weapons
Take a level 5 agent of every class into the field within a single Hangar 6 R&D campaign
Complete DaSilva's perk tree without choosing Lift, Drone, or Mind Control