Haven't got the achievement yet, but yeah, some are infuriating to get, especially the ones that really require you to ace your portal placement and momentum maintenance. I've given up for the time being in lab 18, I think it is. I keep knocking the radio on what I can only assume is an invisible lip to the edge of platforms that only affects objects you're carrying, and it goes spinning off into the goo every time. Grrr.
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