halo 3 odst achievement question?

[Luke]

ok i don't understand the good samaritan achievement. what do you do?

 

[buugleboy]

Trough out the whole campaign you cannot kill any engineers.Meaning those flying alien things that don't attack you.You can also get the naughty naughty achievement by killing 10 if you would rather do that

 

[mr_j526]

Don't kill any Engineers (the floating creatures with the metal spikes, that cast an over-shield on any forces friendly to them) that you come across as the Rookie throughout the entire campaign. Not sure about the engineers that self-destruct when you destroy the other enemies. My thought is if you see any engineers, avoid them at all costs and find another way around them.