Accomplish the indicated achievement to get the number of Gamerscore points:

Mission 01 Cleared (10 points): Successfully complete Mission 01 
Worm Hunter (50 points): Defeat the giant worm. 
Moth Hunter (50 points): Defeat the giant moth. 
"EARTH" Explorer (10 points): Find all of the target marks in Mission 01. 
Ace Medal (30 points): Collect 10 Ace Medals in Elimination matches online. 
Elimination Medal (30 points): Collect 10 Elimination Medals in Team Elimination matches online. 
Conqueror Medal (30 points): Collect 10 Conqueror Medals in Post Grab matches online. 
Hunting Medal (30 points): Collect 10 Hunting Medals in Fugitive matches online. 
Grand Slam (30 points): Collect all four types of medals in matches online. 
Online Master (50 points): Reach level 50 in online battle. 
Chain Killer (50 points): Waste 10 opponents in a row without dying in online battle. 
Head Hunter (50 points): Head shot 50 enemies in online battle. 
Additionally, there are 23 secret achievements:

Mission 02 Cleared (10 points): Successfully completed Mission 02 
"STORM" Explorer (10 points): Find all of the target marks in Mission 02. 
Mission 03 Cleared (10 points): Successfully complete Mission 03. 
"MIRAGE" Explorer (10 points): find all of the target marks in Mission 03. 
Mission 04 Cleared (10 points): Successfully complete Mission 04. 
"METEOR" Explorer (10 points): Find all of the target marks in Mission 04. 
Mission 05 Cleared (15 points): Successfully complete Mission 05. 
"AURORA" Explorer (15 points): Find all of the target marks in Mission 05. 
Mission 06 Cleared (15 points): Successfully complete Mission 06. 
"THUNDER" Explorer (15 points): Find all of the target marks in Mission 06. 
Mission 07 Cleared (15 points): Successfully complete Mission 07. 
"TORNADO" Explorer (15 points): Find all of the target marks in Mission 07. 
Mission 08 Cleared (20 points): Successfully complete Mission 08. 
"VOLCANO" Explorer (20 points): Find all of the target marks in Mission 08. 
Mission 09 Cleared (20 points): Successfully complete Mission 09. 
"RAINBOW" Explorer (20 points): Find all of the target marks in Mission 09. 
Mission 10 Cleared (20 points): Successfully complete Mission 10. 
"BLIZZARD" Explorer (20 points): Find all of the target marks in Mission 10. 
Mission 11 Cleared (30 points): Successfully complete Mission 11. 
"STARDUST" Explorer (30 points): Find all of the target marks in Mission 11. 
Unknown (50 points): Collect all the target coins in each game variant. 
Online Century (50 points): Log more than 100 online matches. 
Extreme Soldier (150 points): Complete all eleven missions in Extreme mode.