Here is the full list of all 40 Crysis achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox 360.
Reach the end of 'Onslaught' in the tank you started with
Kill 10 enemies by throwing an object at them
Kill 20 enemies with grab
Perform a kill with every firearm
Destroy 5 helicopters
Kill 400 enemies
Kill an enemy Nanosuit soldier with a Strength punch
Customize a weapon to use all 5 modification points
Complete 'Core', 'Paradise Lost', 'Exodus' and 'Reckoning' on Delta difficulty
Complete the game on any difficulty
Complete the game on Hard or Delta difficulty
Secure victory in the Battle of Lingshan
Defeat the flight deck invader
Help the marines evacuate
Escort Prophet to safety
Escape the mysterious structure under the mountain
Complete 'Assault', 'Onslaught' and 'Awakening' on Delta difficulty
Defeat General Kyong
Enter the mines
Use all weapon attachments
Speed sprint 3km
Complete all Secondary Objectives
Proceed to the mining complex
Kill 200 enemies
Secure the train station
Complete 6 Secondary Objectives
Destroy 5 enemy tanks
Kill an enemy 200m away
Destroy the cruiser
Destroy all AA guns around the harbor
Perform 5 consecutive kills without being spotted by an enemy
Complete 'Contact', 'Recovery' and 'Relic' on Delta difficulty
Board the VTOL for extraction
Infiltrate the excavation site
Tag 30 enemies using the binoculars
Regroup with Prophet upriver
Rescue the hostage
Complete 3 Secondary Objectives
Discover the fate of the Lusca's Call
Pick up an animal