New Gang: Brandon  -  Use the password SMSLGNG 
New Gang: Cassandra  -  Use the password NSTYGRL 
Select any level  -  Use the password BCKDR 
Unlock all tanks  -  Use the password THRTN 
Unlock all weapons  -  Use the password SRTHMB

All tanks:

Campaign mode passwords:

2 MNVBFBDBGB 
3 RQHBGBSBHB 
4 WRTBTBDBHB 
5 BXMDDCRBJB 
6 LZFDJCWBKB 
7 QTFDTCLBKB 
8 VKRFBCHBKB 
9 FMXFJDWBKB 
10 KJDFYDQBLB 
11 PZDGGDDBLB 
12 WFWGNDFBLB 
13 DKRHCFDBKB 
14 JKXHLFZBKB 
15 NKDHZFNBLB 
16 XZDJLFCBLB 
17 HWQJSGXBLB 
18 RMJKVGLBMB 
19 WFBMMFFBNB 
20 BGHMSHLBNB 
21 GQGNKHJBPB 
22 LSSNWHMBPS 
23 VYDTCHMBRB 
24 FYCTLJRBSB 
25 KPQTYJHBRB 
26 PBJVJJFBSB 
27 TJBWJJCBTB 
28 YNBWXJTBTB 
29 JWNYBKYBIB 
30 SSVYZKKBSB 
31 SSVYZKKBSB 
32 XTVZLKQBSB 
33 HYPBMLCBSC 
34 MSQCKLKBRC 
35 WBQCZLXBRC 
36 BFCDXMVBSC 
37 GCQFJMSBRC 
38 QQPFZMSBSC 
39 VKPGMMMBSC 
40 FHHGSNVBTC