Here is the full list of all 12 Darwinia+ achievements worth 200 gamerscore. It takes around 12-15 hours to unlock all of the achievements on Xbox 360.
Rescue 30 or more Darwinians in the Darwinia Tutorial
Eliminate every single monster on any map in Darwinia (excluding Garden)
Activate the Construction Yard, begin manufacturing Armour and obliterate the Ant Infestation
Complete the Single Player Campaign
Upgrade any research program all the way to level 4
Complete the Epilogue and help the Darwinians launch their first rocket
Win 5 games in any Multiwinia game mode
Win a game in every Multiwinia game mode
Play a game on every Multiwinia map
Win a game of Multiwinia on Xbox LIVE
Invite 5 other players to games of Multiwinia
Kill 65,536 Enemy Multiwinians