This one can be done easily alone.
Open the command console: ESC > Gear Icon > Under the keyboard tab select Advanced > Check off Enable Developer Console
Press the ` button to open the console and type:
map sd_doomsday_event;
That will create your match. Choose the Red Team.
You will need to collect the tickets and trigger the Duck game. Just keep trying until you get it. I found it was the least played of the 3 during my runs. Once you get it, you will be able to collect 200 ducks to win the game. You will then need to collect another 50 so you will need to try and get the game type a 2nd time.
Once you collect the last 50 achievement will pop.