Can you delete achievement points?

I know you can delete game history, but i got a fucking RETARDED achievement from dishwasher a long time ago worth 21 points. my gamerscore looks really odd ending in a 6 and the achievement that evens it out is way too hard to get. 

Nope.

Nope, once you get an achievement, it and the game are forever stained onto your gamercard.

I've never understood the obsession with having a gamerscore ending in 0 or 5. I love gamerscores ending in more bizarre numbers.

if your gamer score ends in 1 or 6 that means your gay.