|Complete the Game on Insane.|
These difficulty achievements can be stacked. Unfortunately, Insane has to be unlocked by playing through the game on Hardcore first UNLESS you play in co-op with a friend who has already unlocked Insane. In that case, you can complete the game in a single playthrough. You'll want to make good use of cover and stay relatively close to your partner. For most of the game you can be revived from anywhere, but you have a better chance of not getting killed in the first place if you work together.
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