I personally try to complete them solo first, because it tends to be safer when it comes to PvP, and then see if I can top my best score with my group, so here are my notes when running solo:

Search first wave husks

• My favourite because you can get super high scores. You get points once you search them, not just breaching. If you see a husk that’s been breached already, you can still search it and get points.
• Electromagnetic Storm for double the points but be careful about lightning strikes and trapped husks that stun you if you don’t dodge roll after breaching.
• Spaceport, if you spawn towards the south of the map you can run on the outskirts clockwise and find many husks on the way to the North Baron (lots of rocketeer husks around it). Go the opposite way if you spawn north, until the South Baron that rests on the big wall.
• Dam Battlegrounds has even more husks I believe, they’re mainly on the Red Lake, the Swamp, and the traffic jam at the north of the map next to the extract point. You can probably run the whole map doing a U to catch all the husks
• I usually bring Adrenaline Shots so that I can keep running and not waste time
• I think you usually can 3 star it with only 5 to 6 husks looted

Damage Leapers

• Wolfpacks, other grenades, heavy ammo weapons do the trick
• You get around 3000 points per Leaper killed (depends on how much damage you personally did to it), so it’s usually two Leapers to get 3 stars

Harvest Plants

• Night raid doubles the points but Lush condition is supposed to have more plants, haven’t tested which one is most profitable
• My favourite spot is north of the Spaceport, you just run in the trench and loot Great Mullein, Mushrooms, and even fruits if there are baskets in the corners

Search Frozen Raider Containers

• Cold Snap map condition only
• New trial so I haven’t figured out a strategy yet
• Look for some sort of siren and clicking sound, it means you’re near one
• Edit: just completed it, 4 Containers for 3 Stars, you just gotta walk around the map and listen for them, way easier as a group to be honest, in my experience so far, people are friendly in teams of 2 because of the cold being a challenge itself

Destroy Ticks

• Any map can work when you know the spawns, I think Stella Montis has the most Arc Enemies, but you’re at the risk of PvP
• What you have to know is that Arc Enemies respawn / are replaced after a while, so you can run back and forth between two locations that contain ticks and they will be respawned once you get back
• It’s around 10 kills for 3 stars I think