Here is the full list of all 20 REPTILOIDS achievements.
120 dead reptiloids
110 dead reptiloids
100 dead reptiloids
90 dead reptiloids
80 dead reptiloids
70 dead reptiloids
60 dead reptiloids
55 dead reptiloids
50 dead reptiloids
45 dead reptiloids
40 dead reptiloids
35 dead reptiloids
30 dead reptiloids
25 dead reptiloids
20 dead reptiloids
15 dead reptiloids
10 dead reptiloids
5 dead reptiloids
3 dead reptiloids
1 dead reptiloid