Dead Rising 4

There are a total of 13 unique skills that can be acquired only in multiplayer. All of these skills are unlocked through various trials. You do not need to unlock each skill, only a total of 10 points out of a possible 19 (some skills have multiple ranks). You will acquire this achievement on the way towards unlocking all trials, and likely all of the multiplayer-only blueprints.

In order to unlock enough skills for the achievement, you will need to complete most but not all of following trials:

Bling III - Create 10 Gold Combo Weapons
Epic Loot III - Kill 25 Loot Zombies
Day Tripper III - Complete 25 Days in Multiplayer
Helping Hand II - Revive another player 10 times
Looter IV - Collect 100,000 Scrap from zombies
Counting Calories - Survive a day without anyone dying or eating food
Pacifist - Survive a day and complete a mission without anyone killing a zombie
I Get Knocked Down - Finish a day where every player is revived once, but no one dies
Zombie Killer MVP III - Earn the Zombie Killer MVP title (by killing the most zombies in a single day) 10 times
Speed Demon - Be the first to arrive at the Safehouse 25 times

When looking at the skills purchasing list. These skills are the bottom tab. They all require you to do specific trials in order to unlock them. Things like helping people up when in a downed state or getting to the safe room first X times. If you look at the skills it will tell you which trials you need in order to unlock the skill. Once you have unlocked 10 of them the achievement will pop. Some of the skills say x/3 meaning there are 3 levels of the skill. Each level counts toward the achievement so if you are 3/3 then you have 3 skills unlocked.

I suggest getting a friend to help with a couple of them in a private game. The ones where you have to help so many people up from a downed state. Just have your friend stay close to the starting room. Kill all the zombies in the area except for a few and then let your friend get downed over and over until you pop this one.

There is also one where you have to have a 4 player game and each player needs to be downed once and no one can die.

I suggest getting a couple friends use the method above for the previous trail. Once each person has been downed and revived once then go back into the safe room and wait until the time hits 9pm then simply run to the exit. Thankfully you only have to do this for one day and not both in a episode. I suggest using episode one for all of these unless you really enjoy the multiplayer.

If you'd like to see more in this guide then let me know what you'd like to see and I'll add it.