Dynasty Warriors: Strikeforce

Here's the full list with the ones you don't necessarily need musou officers for, but you can refer to it if you have a blank on your tactics list and don't know which one you haven't done:


Officer Relationship Combinations
1: Cao's Influence - Cao Cao + Cao Pi + Cao Ren
2: Sun's Bonds- sun jian, sun ce, sun quan
3: Brother's Oath - Guan Yu + Liu Bei + Zhang Fei
4: Strategist's Reckoning - Sima Yi + Zhou Yu + Zhuge Liang
5: Turbans Sanctum - Zhang Jiao + Zhang Bao + Zhang Liang
6: Burning Love- cao pi, zhen ji
7: Young Love - Zhou You + Xiao Qiao
8: Virtuous Love - Yue Ying + Zhuge Liang
9: Devoted Love- Lu Bu, diao chan
10: Pure Love - Liu Bei + Sun Shang Xiang
11: Xiahou's Spirit - Xiahou Dun + Xiahou Yuan
12: Faithful Devotion- sun quan, zhou tai
13: Warrior's Generation - Guan Yu + Guan Ping
14: Princesses Dance- dong zhuo, diao chan
15: Nemesis Bond - Cao Cao + Yuan Shao
16: Iron Men - Dian Wei + Xu Zhu

Type Combinations using 4 Cards
17: Imperial Majesty - 4 "Lord" Cards
18: Poison Strategy+ - 4 "Wood" Cards
19: Engulf Strategy+ - 4 "Fire" Cards
20: Heavy Strategy+ - 4 "Earth" Cards
21: Stun Strategy+ - 4 "Metal" Cards
22: Freeze Strategy+ - 4 "Water" Cards
23: Seal Strategy+ - 4 "Dark" Cards
24: Disband Strategy+ - 4 "Light" Cards
25: Ingenious Minds - 4 "Strategists" Cards
26: Legendary Courage - 4 "Officer" Cards
27: Wei Phoenix - 4 "Wei" Cards
28: Wu Tiger - 4 "Wu" Cards
29: Shu Dragon - 4 "Shu" Cards
30: Chief's Oath - 4 "Other" Cards

Type Combinations Using 2 Cards
31: Imperial Presence - 2 "Lord" Cards
32: Poison Strategy - 2 "Wood" Cards
33: Engulf Strategy - 2 "Fire" Cards
34: Heavy Strategy - 2 "Earth" Cards
35: Stun Strategy - 2 "Metal" Cards
36: Freeze Strategy - 2 "Water" Cards
37: Seal Strategy - 2 "Dark" Cards
38: Disband Strategy - 2 "Light" Cards
39: Agile Minds - 2 "Strategists" Cards
40: Fearless Courage - 2 "Officer" Cards
41: Wei's Ambition - 2 "Wei" Cards
42: Sun's Solidarity - 2 "Wu" Cards
43: Shu's Aspiration - 2 "Shu" Cards
44: Chief's Union - 2 "Other Forces" Cards

complete list thanks to DWX131415, DrakeBueno, an Rampidzier on gamefaqs message board

In pre-battle screen, you can place your officer cards in certain combination to use a tactic. To unlock this achievement, you have to use all tactics available. The tactics you have already used can be viewed in City menu -> Page 2 -> Vault -> Tactics. The tactics you've used in online game also counts, so it's possible to unlock this achievement without having all the cards needed.

The combination of officer cards to use tactics is divided into two groups. For the first group, you need to place 2 or 4 officer cards of a same kind. That is, officer cards of same force (Wei, Wu, Shu, Others), same type (Officers, Strategists, Lords) or same attribute (Wood, Fire, Earth, Metal, Water, Dark, Light). This type of tactics are simple and you'll find little difficulty what you are missing by checking Vault -> Tactics.

The second group of tactics calls for combination of specific officer cards and this is the hard part. There are 16 of them. No real workaround here, so you have to get the card needed yourself or find someone on online who have it and use the tactic together.

1. Cao's Influence
Cao Cao, Cao Pi, Cao Ren

2. Sun's Bonds
Sun Jian, Sun Ce, Sun Quan

3. Brothers' Oath
Liu Bei, Guan Yu, Zhang Fei

4. Strategist's Reckoning
Sima Yi, Zhou Yu, Zhuge Liang

5. Turbans' Sanctum
Zhang Jiao, Zhang Bao, Zhang Liang

6. Burning Love
Cao Pi, Zhen Ji

7. Young Love
Zhou Yu, Xiao Qiao

8. Virtuous Love
Zhuge Liang, Yue Ying

9. Devoted Love
Lu Bu, Diao Chan

10. Pure Love
Liu Bei, Sun Shang Xiang

11. Xiahou's Spirit
Xiahou Dun, Xiahou Yuan

12. Faithful Devotion
Sun Quan, Zhou Tai

13. Warrior Generations
Guan Yu, Guan Ping

14. Princess' Dance
Dong Zhuo, Diao Chan

15. Nemesis Bond
Cao Cao, Yuan Shao

16. Iron Men
Dian Wei, Xu Zhu