Here is the full list of all 37 Third Front achievements.
Found 500 diversionists
Found 125 diversionists
500 units of equipment were purchased
125 units of equipment were purchased
Complete Germany campaign
Complete the Alliance campaign
Captured all the cities
Complete the USSR campaign
250 cities are captured
The population reached a mark of 100,000,000
Earned 10,000,000
200 cities are captured
Earned 2,500,000
The main building is improved to level 40
25 diversions prevented
150 cities are captured
The main building is improved to level 30
Found 25 diversionists
The population reached a mark of 50,000,000
100 cities are captured
The main building is improved to level 20
25 units of equipment were purchased
The population reached a mark of 20,000,000
10 diversions prevented
50 cities are captured
5 diversions prevented
Found 5 diversionists
The main building is improved to level 10
The population reached a mark of 5,000,000
20 cities are captured
Earned 500,000
The main building is improved to level 5
5 units of equipment were purchased
10 cities are captured
Diversion prevented
3 cities are captured
Earned 50,000