Certificates? Awards? I think you've got the wrong idea. Firstly, they say you cannot bring anything in. No testimonials, no certificates etc. Secondly, they're not looking for what you've accomplished per se. They don't have to have someone who's hiked Everest to be qualified to become a doctor. They just need normal people who've done normal things, and as long as your friend has lived a normal life, they should have plenty of experiences which they can quote. The main ones which come up are describing situations where you have been:
1. A team member
2. A team leader
3. Under pressure/stress/emotional trauma
4. Problem solving
Even with these, you don't need anything significant. You can just quote a scene with you and your friends hanging out somewhere, and then getting lost or something. Awards are definitely not the thing to be going for.