I use the terms soft lock stealing and hard lock stealing.
Soft lock stealing is when you do not benefit opponents achievements. You need to do all the work yourself. And you do not set them back more than the re-locking necessary.
Hard lock stealing, you are really stealing. However, some games are fun and fine for even serious competitive play despite this. Usually when the multiball is only a 2 ball deal. And where making the lock is easier. But starting multiball is harder.
Taxi is the best one I can think of.