Complete first level of the campaign
Complete first level on hard difficulty
Complete first level on extreme difficulty
Complete second level of the campaign
Complete second level on hard difficulty
Complete second level on extreme difficulty
Complete third level of the campaign
Complete third level on hard difficulty
Complete third level on extreme difficulty
Complete fourth level of the campaign
Complete fourth level on hard difficulty
Complete fourth level on extreme difficulty
Find all secrets on level 1
Find all secrets on level 2
Find all secrets on level 3
Find all secrets on level 4
Kill all enemies on level 1
Kill all enemies on level 2
Kill all enemies on level 3
Kill all enemies on level 4