How do I list iTunes apps by the account that purchased it?
You can try in Terminal.

$ for f in ~/Music/iTunes/iTunes\ Media/Mobile\ Applications/*.ipa ; \
  do (echo "$f" ; unzip -p "$f" "iTunesMetadata.plist" | \
  plutil -p - | egrep -i "\"(itemName|artistName|AppleID)\"" ) | \
  perl -e 'while (&lt;&gt;) { if (m!^/!) { chop; $fqn=$_; } if (m/"(.+)" =&gt; (".+")/) { $e{lc($1)}=$2; } } print "\"${fqn}\",$e{\"itemname\"},$e{\"artistname\"},$e{\"appleid\"}\n";'; \
done


Here is a blogpost where this action is explained.