Hi, can you be a little more specific for the 'according to plan' achievement? I must have tried it 20 times but it won't unlock. Do you mean that the enemies just can't shoot at you, or can't be alerted at all? If its the latter, then I think it's impossible.
Also you say 2 elites, but I've got grunts, 1 elite and 2 shield dudes. Also, none of the grunts jump on the turrets after I've taken out the gunners. Thanks.