I didn't have many savages because the tool tip on them says 'can map sectors faster than normal explorers'. Why would I need more than one ? There was no indication they had a higher drop rate of event items than any other explorer. The lucky explorer, for which you pay double, mentions loot so shouldn't you get more eggs from a more expensive explorer ?
Personally I think the number of eggs needed to get the achievements for this should be the same as the adventure ones or as one person in this thread mentioned they should have been reversed, i.e you should need to get the 3200 eggs from adventure loot and only 1200 from your explorers. I probably have gained close to 2k eggs from adventures and haven't really been trying, whereas, I am going to be lucky to even get the 30 point achievement for explorers nevermind about the 50 point one.

