Here is the full list of all 38 Men In Black: Alien Crisis achievements worth 1,000 gamerscore.
Froze 30 enemies with the Icer (P1)
Defeated 50 enemies with the Std. Issue 1995 (P1)
Crashed Chauncey's party in Story Mode
Successfully finished the Virtual Reality training program in Story Mode
Escaped Serleena's drag attack
Achieved a 25x multiplier in Story Mode
Defeated 100 enemies with the Adorian Crossbow (P1)
Didn't get detected while flying the car
Defeated 20 enemies with the Rocket Launcher while flying the car
Defeated 40 bikers in Story Mode
Defeated the Adorian Elite Guard in Story Mode
Started playing in Story Mode
Dodge the mines placed by Nethera in Story Mode
Defeat 70 bikers in Story Mode
Destroy 3 enemy platforms in Story Mode
Neuralize 7 humans in Story Mode
Defeat the Nakkadan Elite Guard in Story Mode
Scan 2 hidden aliens in Story Mode
Defeat enemies using 10 different combos (P1)
Achieve at least 150,000 points in one V.R. Mission (P1)
Achieve at least 200,000 points in one V.R. Mission (P1)
Achieve at least 300,000 points in one V.R. Mission (P1)
Complete all the Competitive maps in V.R. Missions (P1)
Defeat 60 enemies with the Noisy Cricket (P1)
Defeat 250 enemies with the Tribarrel (P1)
Defeat 350 enemies with the Tribarrel (P1)
Defeat 200 enemies with the BANGer (P1)
Use the Anti-Gravity grenade on 30 enemies (P1)
Use the Refracto Shield to reflect 100 enemy projectiles (P1)
Defeat 30 enemies while they're under the effect of the Cerebro Accelerator (P1)
Defeat 700 enemies (P1)
Defeat Khnemu in Story Mode
Complete Story Mode as an Agent
Gather 50 upgrade points
Defeat 900 enemies (P1)
Defeat Nethera and save Catyana
Complete Story Mode as an Elite Agent
Complete all the missions in Story Mode