Surprisingly, Nepal have won one medal in Olympics.

Its from my memory.

Medal Winner - Bidhan Lama
Event - Martial Arts (may be taekwakdo or judo)
Medal Won - Bronze
It was held in Asia (probably japan)
He got the medal for reaching the semis and loosing. As the loosers of semis in martial art gets bronze, he got one too.
However, he is not included in the official medal tally due to some reason.