Carry Weight Glitch in Skyrim

Console commands do not affect achievements in Skyrim. I've used it to clip through places when I ended up falling and becoming stuck and still received achievements in the same session. I've also togged tgm on occasion while testing stuff and still received achievements after I finished testing without restarting my game.

Once you get past all the speculation, this thread seems to confirm that using console commands do not affect achievements at all.

Of note from that thread:

• One person got the buy a house achievement right after giving himself 5000 gold via additem.
• Another person still continued to receive achievements despite walking around with an max encumbrance weight of 5000 via modav.

You cannot get back there without console commands. The console command you are looking for is "coc " and you'll probably need to do it again to get out.

Use coc skuldafn02 to get there. The codes for Skuldafn are skuldafn01 trough skuldafn04. 02 should put your back in the Skuldafn temple. coc whiterun might bring you back home. Not sure about the last one.