All right, this achievement is not real difficult, you just need to unlock one medal. Not necessary a gold medal.
If you own this game, on your Game Room on your XBOX, then it will be much easier to win a medals. If you had not, then this may be a little more difficult than expected. You can however, get quite simply the the time medal (30 minutes) to after that of survival you will need a little training.
Finally I said that you do not need to get the 1 gold medals to unlock this achievement ;)