With the new liquid UUM system, it doesn't seem to be possible to get the "Pink Blob" achievement. (I'm using version 397 for 1.6.4.) I've tried "/achievement unlock Flexico pink_blob" and it said in the chat "Achievement Unlocked", but I don't get it in the Achievements menu. Is there any way to actually get it?
UU-Matter achievement
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Currently there is no way, you get the old "Better than iron" achievement by taking an iron ingot out of a furnace
Achievements really haven't been looked at and so no, there is no way past just cheating it.