Here is the full list of all 23 Blast Em! achievements.
Kill 100 Evil robots
Avoid collecting coins for 10 seconds
Avoid collecting coins for 20 seconds
Avoid collecting coins for 30 seconds
Avoid collecting coins for 40 seconds
Avoid collecting coins for 50 seconds
Avoid collecting coins for 60 seconds
Avoid collecting coins for 70 seconds
Avoid collecting coins for 80 seconds
Avoid collecting coins for 90 seconds
Avoid collecting coins for 100 seconds
Kill 1000 Evil robots
Kill 10000 Evil robots
Get this promotion when your accumulated score gets above 1000
Get this promotion when your accumulated score gets above 3000
Get this promotion when your accumulated score gets above 6000
Get this promotion when your accumulated score gets above 10000
Get this promotion when your accumulated score gets above 15000
Get this promotion when your accumulated score gets above 20000
Get this promotion when your accumulated score gets above 28000
Get this promotion when your accumulated score gets above 38000
Get this promotion when your accumulated score gets above 45000
Get this promotion when your accumulated score gets above 60000