shouldn't you be able to just select the start wave as 50 for Icy Dead People then, or is nothing showing on the stats screen?
I know my stats were showing 46/50 or similar for the Flashback 1-10 achievements, so I worked out which maps were most likely to be required by checking my maximum scores on each of the maps, and then starting on level 6 or so on the most likely candidates and then just working through to 10 on them all.
After than I still needed 1 level, so played level 1 of each map until it popped.
#9223039, By dancingrob Gears of War 3
dancingrob 1,231 posts
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