Here is the full list of all 50 F.E.A.R. 3 achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Complete Interval 08
Finish the Campaign on any difficulty (all Intervals complete)
Complete Interval 07
Complete Interval 06
Make 100 Psychic Links (Share or Steal)
Attain Rank 10
Kill 1000 enemies by any method in any game mode
Find something worth punching!
Attain a total of 250,000 points through challenges
Complete Interval 05
Complete Interval 04
Complete Interval 03
Complete Interval 02
Complete Interval 01
Finish the Campaign on INSANE difficulty
Attain Rank 21
Find the Alma Doll on every Mission
Possess every type of possessable enemy
Complete 30 challenges in one Interval
Complete every challenge at least once
Complete 500 total challenges between all categories
Attain a total of 95,000 score on Interval 01
Attain a total of 85,000 score on Interval 02
Attain a total of 95,000 score on Interval 03
Attain a total of 105,000 score on Interval 04
Attain a total of 110,000 score on Interval 05
Attain a total of 70,000 score on Interval 06
Attain a total of 110,000 score on Port Authority
Attain a total of 50,000 score on Interval 08
Kill 250 total enemies during Slow-Mo
Pin 100 total enemies with The Penetrator or Leaper knives.
Kill 100 enemies with the Jump Kick or Slide Kick
Kill 10 enemies in a row with Sniper Rifle headshots
Kill 2 enemies with 1 Slide Kick during Slow-Mo
Kill 20 enemies with a crowbar
As Pointman, kill 100 enemies suspended by Fettel
As Fettel, suspend 100 enemies that Pointman kills
Perform 50 revives in any game mode
Survive 3 waves in Contractions in a row without anyone bringing back a crate
Finish a wave of Contractions on INSANE without anyone going into Last Stand
Spend an entire round of Contractions in deep fog without going into Last Stand
Complete wave 20 in Contractions
Return 30 crates in one game of Contractions
Possess 20 different enemies in one round of Soul King
Win all 5 rounds of a 5-round Soul King match
Attain a total of 6,000 Souls in one round of Soul King
Attain a total of 25,000 Souls across all rounds of a Soul King match
Win 20 rounds of Soul King
In the Poker Room of Prison, kill all 3 enemies with headshots before slo-mo ends.
Complete any campaign level on INSANE without reloading checkpoints or going into Last Stand.