Yes, xbox games have 1000 max unless you have add on packs.  PC games do have 1000 too.  Windows 8 games are 400 (for now) and windows phone games max at 200.

You can make a game very easy and many people will get it just for the cheevos.  There is a very easy game out there you can get 1000/1000 in like 3 minutes. (I don't give tips out so, I'm not going to tell you which one).  That game is rented all the time and has gotten a lot more sales because of it.  So yes if you make games you could put out bad game which wouldn't cost much time or money to make and it would probably make you a profit if you have easy cheevos.