Only a "dash" of MP would be fine. Dead Space 2 is the best example I can think of - no MP achievements. Hell I never even tried it's MP. Max Payne 3 was actually a pleasant surprise for me and I ended up playing the MP quite a bit past just going for the achievements. Hopefully this will be along those lines; because with 240G for just the MP it seems they've put alot of stock in it.
139 Full @ 1000G or >
& 43 XBLA @ 100%