gears horde achievement question

For the achievements that say you have to complete lvl 1-? and be at lvl whatever, can you do lvl 1-X, at one time and do X-the end another and still get the achievement? Probably not the best way to say it, hope you understand. thanks

So saying level 1 through 10, then come back at and continue where you left off at a seperate time? Then yes. Can even change maps. For Horde the Horde achievement.mrgab

i was stuck at 39/40 , took forever to figure out which one i missed cause i kept doing them from 1-10 with randoms on live