PDMulti

Here is a detailed explanation of the system. Basically, every time you score five points you go up a rank. The five points do not all have to come from the same statistic.

Accuracy Medals                   HeadShot Medals               KillMaster Medals
1 point - 6                             1 point - 6                         1 point - 6
2 points - 12                          2 points - 12                      2 points - 12
3 points - 24                          3 points - 24                      3 points - 24
4 points - 48                          4 points - 48                      4 points - 48
5 points - 84                          5 points - 84                      5 points - 84
6 points - 180                        6 points - 180                    6 points - 180
7 points - 300                        7 points - 300                    7 points - 300
8 points - 450                        8 points - 450                    8 points - 450
9 points - 630                        9 points - 630                    9 points - 630
10 points - 900                      10 points - 900                  10 points - 900

Survivor Medals                     Games Won                       Kills
1 point - 6                              1 point - 6                         1 point - 6
2 points - 12                           2 points - 12                      2 points - 120
3 points - 24                           3 points - 24                      3 points - 240
4 points - 48                           4 points - 48                      4 points - 480
5 points - 84                           5 points - 84                      5 points - 960
6 points - 180                          6 points - 180                    6 points - 1680
7 points - 300                          7 points - 300                    7 points - 3600
8 points - 450                          8 points - 450                    8 points - 6000
9 points - 630                          9 points - 630                    9 points - 9000
10 points - 900                        10 points - 900                  10 points - 18000

Damage Dealt                          Distance                            Ammo Used
1 point - 0.6k                           1 point - 60.0km                 1 point - 3000
2 points - 1.2k                         2 points - 120.0km              2 points - 6000
3 points - 2.4k                         3 points - 240.0km              3 points - 12000
4 points - 4.8k                         4 points - 480.0km              4 points - 24000
5 points - 8.4k                         5 points - 840.0km              5 points - 42000
6 points - 18.0k                       6 points - 1800.0km             6 points - 90000
7 points - 30.0k                       7 points - 3000.0km             7 points - 150000
8 points - 45.0k                       8 points - 4500.0km             8 points - 225000
9 points - 63.0k                       9 points - 6300.0km             9 points - 315000
10 points - 90.0k                     10 points - 9000.0km           10 points - 450000

Time
1 point - 2-4 hrs
2 points- 4-8 hrs
3 points - 8-16 hrs
4 points - 16 hrs-1 day 4 hrs
5 points - 1 day 4 hrs-2 days 12 hrs
6 points - 2 days 12 hours-4 days 4 hrs
7 points - 4 days 4 hrs-6 days 6 hrs
8 points - 6 days 6 hrs-8 days 18 hrs
9 points - 8 days 18 hrs-12 days 12 hrs
10 points - 12 days 12 hrs and up