14 achievements for 1000 Gamerscore
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Fearless
Kill 6,000 Aliens
50 Gamerscore
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Zombie Killer
Kill 4,500 Stinger(s)
50 Gamerscore
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Zombie Nightmare
Kill 2,400 Smasher(s)
50 Gamerscore
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Killer of Alien
Kill 3,000 Explorer(s)
50 Gamerscore
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Expeller of Aliens
Kill 3,000 Megascarab(s)
50 Gamerscore
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Shadow of Death
Kill 2,000 Elite(s)
50 Gamerscore
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Master of Collection
Obtain 6 weapons
50 Gamerscore
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Heavy Tank
Use Machine Gun for 300 times
50 Gamerscore
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Machine Breaker
Use Machine Gun for 300 times
50 Gamerscore
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Defender of Autocanno
Using Autocannon 300 times
50 Gamerscore
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Master of clearing Stage
Clear Stage 3-7
100 Gamerscore
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Star Picker
Collect 63 Stars
100 Gamerscore
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Every little helps
Collect 2,000,000 Gold
100 Gamerscore
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Millionare
Collect 3,200 Energy
200 Gamerscore