For the sake of time, I went through the list quickly. You can slow down the video to read which clan the officer is from.

Timestamps:
0:00 - A
0:50 - B
0:59 - C
1:03 - D
1:03 - E
1:16 - F
1:21 - G
1:27 - H
2:15 - I
2:51 - J
2:52 - K
3:55 - M
4:48 - N
5:14 - O
5:44 - R
5:49 - S
6:42 - T
7:15 - U
7:31 - W
7:35 - Y

A few tips to make finding certain officers easier:

Acquiring the CAW characters are similar to the rest of the Generic Officers. You will simply have to fight or encounter them in a map (ally or not).

I naturally got all the CAWs through normal play and did not need to fulfill specific requirements such as having certain characters as secondary or increasing friendship with a particular famous officer.

You can check the Battle Info before starting the Battle and see if the specific officer is in the battle with you. If not, exit and load back in to Chronicles. This will randomize the officer spawn pool during that battle. This can hunt down specific officers.

i.e. if you're looking for Baba Nobufusa, you can find a battle with Takeda Shingen (preferably as enemies), load in, check for the officer. Exit and reload if they're not there, otherwise, fight and you should unlock their biography.