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