Nell: Complete the Campaign or Hard Campaign with an A-Rank average score
Hachi: Complete the Hard Campaign
Olaf: Complete “Factory Blues” in the Campaign
Grit: Complete “Factory Blues” in the Campaign
Colin: Complete “Factory Blues” in the Campaign and buy either Olaf or Grit
Kanbei: Complete “The Hunt’s End” in the Campaign
Sonja: Complete “The Hunt’s End” in the Campaign
Sensei: Complete “The Hunt’s End” in the Campaign and buy either Kanbei or Sonja
Eagle: Complete “Great Sea Battle” in the Campaign
Drake: Complete “Great Sea Battle” in the Campaign
Jess: Complete “Great Sea Battle” in the Campaign and buy either Eagle or Drake
Lash: Complete the Campaign
Adder: Complete the Campaign
Hawke: Complete the Campaign or Hard Campaign with a B-Rank average score
Sturm: Complete the Campaign or Hard Campaign with an S-Rank average score

Hard Campaign: Complete the Campaign
Sound Room: Complete the Campaign

Orange Star Lab Mission: Capture the city closest to your HQ in “Flak Attack”
Blue Moon Lab Mission: Capture the city in the south-west on the bridges near Lash’s HQ in the mission “Toy Box”
Yellow Comet Lab Mission: Capture the central city on the south-west beach in the mission “Show Stopper”
Green Earth Lab Mission: Capture the southern city on the western island in the mission “Sinking Feeling”
Secret Dialogue: In the mission “Cleanup”, move all of your units until they are all completely out of fuel. You will get some special alternate dialogue from Nell.

“Nintendo” Map: Hold L+R when starting Design Maps to load a special map.
Secret Dialogue: When in Design Maps, attempt to place a unit in an illegal position 50 times in a row. You will get some special dialogue from Nell.

Campaign: Clear every single map in the campaign once (including the Orange Star hard campaign set)
War Room: Clear every single map in the War Room
Versus: Play every single map at least once
Battle Maps: Purchase every single item from Hachi
Link, Design Room: These turn golden when all the other menus have met their requirements