I achieved all gold medals (both training and missions) and pass elite in deathmach mode, and i have 85%. What else do i need for full 100%?

100% is unachievable, unless you never lose a game. It's not really a completion percentage, but more like a team rating.

Excuse me, but this is the fourth time I saw people asking the same question.

Here're the other three:
http://forum.team17.co.uk/showthread.php?t=40919
http://forum.team17.co.uk/showthread.php?t=36153
http://forum.team17.co.uk/showthread.php?t=36826