Here is the full list of all 35 Lost Planet: Extreme Condition achievements worth 1,000 gamerscore.
Successfully cleared all missions in Extreme Mode.
Found all of the target marks in every mission.
Reached level 50 in online battle.
Logged more than 100 online matches.
Collected 10 Hunting Medals in Fugitive matches online.
Collected all four types of medals in matches online.
Collected 10 Conqueror Medals in Post Grab matches online.
Collected 10 Ace Medals in Elimination matches online.
Collected 10 Elimination Medals in Team Elimination matches online.
Head shot 50 enemies in online battle.
Wasted 10 opponents in a row without dying in online battle.
Successfully completed Mission 11.
Found all of the target marks in Mission 11.
Successfully completed Mission 10.
Found all of the target marks in Mission 10.
Successfully completed Mission 09.
Found all of the target marks in Mission 9.
Successfully completed Mission 08.
Found all of the target marks in Mission 8.
Successfully completed Mission 07.
Found all of the target marks in Mission 7.
Successfully completed Mission 06.
Found all of the target marks in Mission 6.
Found all of the target marks in Mission 5.
Successfully completed Mission 05.
Defeated the giant moth!
Successfully completed Mission 04.
Found all of the target marks in Mission 4.
Successfully completed Mission 03.
Defeated the giant worm!
Found all of the target marks in Mission 3.
Successfully completed Mission 02.
Found all of the target marks in Mission 2.
Successfully completed Mission 01.
Found all of the target marks in Mission 1.