Here is the full list of all 10 Ranger vs Space Mutants achievements.
Lvl 1 Comple
Lvl 2 Comple
Lvl 3 Comple
Lvl 4 Comple
Lvl 5 Comple
Lvl 6 Comple
Lvl 7 Comple
kill 1 boss
maim the boss
kick ass boss