Researcher - Collapse 10 Stars, then build the ascension device.

Trader - Collect 1 billion Rare ore (that's based off 1500 people value scales like the Warlord)

Warlord - Destroy 10% of the home worlds or 20 home world which ever is greater.

Explorer (Anyone can do) - Control 13 of the 25 Artifact Planets - That requires beating the aliens, which will not be an easy feat.