I have created an excel sheet listing all enemy types by difficulty. I was using it for myself to help target the difficult enemy commendations, but thought I might as well share it in case it’s of use to anyone:
Link to online excel sheet
Alternative version showing an Episode per tab
There is already an excellent topic on here by TheSchnitzelMan which I highly recommend as it offers lots of useful info/tips on Spartan OPs in general. However, I believe his enemy counts are for Easy difficulty only, hence my reason for posting this. I have found the difficulty setting makes a large difference to the enemy types and their numbers.
Mods, if you consider this to be a duplicate thread, feel free to lock it down, but I hope you agree it’s bringing something different to the table.
Below, I have listed the best mission/difficulty combinations I have come across so far (all of these numbers are obviously for Solo play).
Also, note that the commendation name and waypoint stats names are sometimes quite different. I have put the commendation name first, and the waypoint stats name in brackets afterwards. The ones in red are not needed for any commendations, but have been included for completeness.
The list is particularly useful if you need to kill 20 Hunters/70 Jackals/80 Elites/100 Grunts etc. to meet a challenge but don’t have much time.
Some of the numbers are averages from multiple playthroughs and are not a guarantee that you’ll get that number everytime. For example, Ep1 Ch3 on Legendary I have had 11, 7, 11, 11 for Crawler - Snipers, averaging 10 as shown on the spreadsheet.
Tips: Let Watchers spawn Crawlers from the ground before killing them. Also, Knights can be respawned once each, so if there are Watchers around leave them alive until they’ve respawned a Knight or two!
On Episode 5, Chapter 1 “Spartan Miller”, if you do not activate the Jammer at the end straight away, several waves of Knights & Crawlers will continue to spawn (try to keep a Watcher alive as well to respawn Knights).
Grunt (Storm Grunt): Ep5 Ch4 Easy = 53
Grunt Imperial (Imperial Grunt/Grunt Ranger): Ep5 Ch4 Legendary = 58
Grunt Ultra (Grunt Heavy): Ep7 Ch4 Legendary = 88
Jackal (Storm Jackal): Ep3 Ch4 Normal = 23
Jackal Major (Jackal Heavy): Ep7 Ch4 Legendary = 33
Jackal Ranger (Jackal Ranger/Jackal Sniper): Ep7 Ch3 Legendary = 60
Elite (Storm Elite): Ep3 Ch4 Easy = 44
Elite Zealot (Elite Ranger): Ep3 Ch5 Heroic = 21
Elite Officer (Elite Commander/Elite Zealot): Ep 3 Ch4 Legendary = 54
Elite General (Elite Warrior): Ep10 Ch1 Legendary = 21
Hunter (Hunter): Ep 3 Ch4 Easy/Normal = 14
Crawler (Crawler): Ep2 Ch5 Easy = 78
Crawler Sniper (Crawler Snipe): Ep5 Ch1 Legendary = 16
Crawler Prime (Alpha Crawler): Ep2 Ch5 Legendary = 72
Watcher (Watcher): Ep5 Ch1 Easy/Normal = 40
Knight (Knight): Ep5 Ch1 Normal/Heroic = 35
Knight Battlewagon (Knight Battlewagon/Knight Lancer): Ep5 Ch1 Normal = 29
Knight Commander (Knight Commander): Ep6 Ch5 Legendary = 7
Ghost: Ep10 Ch3 Legendary = 12
Banshee: Ep3 Ch4 Easy/Heroic/Normal = 28
Wraith: Ep1 Ch1 & Ep5 Ch5 All Difficulties = 5
Phantom: Ep4 Ch5 Easy = 12
If it’s of use to anyone, great. If not, that’s fine too but I thought I’d share 
If you come across any better mission/difficulty combinations let me know. I’m slowly working through them all as a personal goal to complete the spreadsheet anyway.
I’ll also be tackling Episode 6 which launched today as well.
Good luck Spartans!
