Here is the full list of all 35 Far Cry Instincts Predator achievements worth 1,000 gamerscore.
Evolution Story finished at Rookie difficulty level
Instincts Story finished at Rookie difficulty level
50 Trap kills in any solo mode
All online Game Mode won once
Steal the Sample Mode winner once
Predator Mode winner once
Team Chaos Mode winner once
Chaos Mode winner once
Seek n' Secure Mode winner once
Instincts Story and Evolution Story completed
Evolution Story finished at Hunter difficulty level
Instincts Story finished at Hunter difficulty level
80 Feral punch kills reached in any solo mode
100 Headshots in any solo mode
Finish the Instincts Story at Predator difficulty level
Accomplish 40 Stealth kills in any solo mode
Finish the Instincts Story at all difficulty levels
Find all of Doctor Krieger's lost research dispatched on every map from both Stories
Get ranked first 50 times in the Multiplayer Chaos Mode
Get ranked first 50 times in the Multiplayer Team Chaos Mode
Get ranked first 50 times in the Multiplayer Steal the Sample Mode
Get ranked first 50 times in the Multiplayer Predator Mode
Get ranked first 50 times in the Multiplayer Seek n' Secure Mode
Get ranked first 300 times in all Multiplayer Game Modes
Play 80 hours in any of the Multiplayer Game Modes
Accomplish 300 headshots in any Multiplayer Game Mode
Accomplish 1000 Total Kills in any Multiplayer Game Mode
Accomplish 10 multikills in any Multiplayer Game Mode
Accomplish 200 Kills with Grenades in any Multiplayer Game Mode
Accomplish 100 Kills by Road Kills in any Multiplayer Game Mode
Accomplish 150 Feral Punch kills in any Multiplayer Game Mode
Accomplish 100 Traps kills in any Multiplayer Game Mode
Finish the Expansion Story at Predator difficulty level
Evolution Story completed at all difficulty levels
Finish the Instincts Story and the Evolution Story at all difficulty levels