Here is the full list of all 21 Space Explorers: Lunar Mission (EU) trophies - there are 6 bronze, 6 silver, 8 gold and 1 platinum.
Moon Master
Bailly
Clavius
Langrenus
Solar Panels
Comm Tower
Antenna
Outpost2
Silo Pack
Signal Post
Petavius
Maginus
Fra Mauro
Lunar Post
Albategnius
Hydroponic
Rheita
Tycho
Seleucus
Janssen
Humboldt