Knock-knock
Kill 4 enemies with 4 shots during a slow-mo breach in Single Player or Special Ops.
（0.48 分）
| 名次 | 名称 | 解锁时间 |
|---|---|---|
| 1 | DR | |
| 2 | lokk | |
| 3 | shuckit | |
| 4 | Fireslide | |
| 5 | mathijs & karlijn | |
| 6 | aksho | |
| 7 | CAMEEEEEEEEEE | |
| 8 | Crayons | |
| 9 | SlyCer | |
| 10 | DR.Wuu | |
| 11 | chaz | |
| 12 | kLOtz_mIt_gUmmI_Und_LSD | |
| 13 | HansGruber | |
| 14 | Baumi | |
| 15 | paraSaint | |
| 16 | Elusiv | |
| 17 | Justray2k | |
| 18 | OberfragGER | |
| 19 | makas` | |
| 20 | BLLT | |
| 21 | Enigma | |
| 22 | Flurry | |
| 23 | b_B | |
| 24 | manofinaction | |
| 25 | Kravael | |
| 26 | rheiv | |
| 27 | looga | |
| 28 | Orbitizer | |
| 29 | kenta | |
| 30 | Spork | |
| 31 | AC_Slater | |
| 32 | weeman | |
| 33 | Smashwa | |
| 34 | Nancy | |
| 35 | Maurs | |
| 36 | Sh4rP | |
| 37 | dnL 맥주 | |
| 38 | DANGER DUDE | |
| 39 | i.see | |
| 40 | zrex | |
| 41 | [DAD]Meatloaf | |
| 42 | aerx | |
| 43 | GReeN_ORB | |
| 44 | Viper | |
| 45 | FaTe[F8S] | |
| 46 | dice | |
| 47 | LORAZ | |
| 48 | NeuroFuzzy | |
| 49 | Red-Headed StepChild | |
| 50 | Red7777 |