Noticed a thread in game support about it happening on the Steam version.
Just wanted to drop a line here and see if anyone else didn't get the "What Remains" achievement/trophy.
EDIT: Not 100% sure the TTG download version or the mobile version have achievements so I'm leaving them out.
EDIT 2: Forget about this thread, they just right now patched the issue.
"We have just released a patch for this issue. Once this patch downloads, restart your game on Steam, and then rewind to the final checkpoint in Episode 5 and replay to the credits. The achievement should pop now." - MattP of TellTale