Quantum of Solace
50 Achievements
1,000
3030 was a double
Eliminate 100 players while in cover across all games.
20
How to unlock the 3030 was a double achievement in Quantum of Solace - Definitive Guide
You can also use this for the 'get 10 blind kills from cover' achievement (The Nature of Evil). In that case, take cover and aim in the general direction of the player and just pull the right trigger, do not zoom in by pulling the left trigger).
This is an easy one, and includes kills from both blind fire and aiming from cover. Just reach the total, taking every opportunity that arises. You should be using cover regularly anyway, so this should come quickly enough.
This is a multiplayer achievement and can only be done in ranked matches.
This should come naturally while playing multiplayer. To get in cover, press A near a wall or something you can hide behind. To shoot someone while in cover, you can either blind fire by just pressing RT or you can aim and shoot them by pressing LT to aim and then RT to shoot.
The easiest way to get kills while in cover is to play Golden Gun mode and get the Golden Gun. It will only take one shot to kill someone with the Golden Gun and everyone will be coming towards you to try and kill you to get the gun. Aim at the ground by their feet because the bullet will explode when it hits the ground and it will kill them.
If you need help with this achievement, please use the Quantum of Solace Achievement Trading Thread.