Here is the full list of all 13 Söldner-X: Himmelsstürmer trophies - there are 9 bronze, 3 silver and 1 gold.
Reach ultimate rank 15: Galaxy Superstar
Complete the fifth world on "impossible"
Reach a score of 2,000,000
Complete an accumulated total of 3,000 chains
Complete the fifth world on "hard"
Play for five minutes without losing any health
Complete the fifth world
Complete the second world on Rank "S"
Kill an accumulated total of 50,000 enemies
Collect all 20 secret keys
Collect at least four keys in each world
Complete the fourth world
Complete the first world