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