5 1 4Actions Report Solution Don´t use any special weapons in boss stages. Easy if you have enough energy tanks. It should pop just after you kill the 8th boss. If you are after the conservationist achievement, you should unlock this one along the way.Showing all 4 comments. Leave a comment. Do you have to kill all 8 in the same game?Posted by Eric Filtro on 22 May 11 at 16:18 Yep, all 8 on the same playthrough. Just try to kill them while having multiple energy tanks on each fight and you will get it in no time.Posted by KMetalmind on 28 May 11 at 16:44 Can I do it on the Wily stage?Posted by themegamancave on 30 Aug 11 at 00:56 Yeah, you can do it in that stage :)Posted by KMetalmind on 31 Aug 11 at 17:08 Leave a comment