Born Dead Achievement
Kill all the soldiers of the Epilogue before they spawn.
There are 7 normal enemies in the Epilogue. Kill all 7 before they spawn for this achievement. You should be saving on every piece of solid ground, that way, if you mess up, you can reload and try again. Be quick as some of the soldiers seem to spawn rather quickly.
Please note that the achievement will unlock at the end of the game, when the credits begin.