Here is the full list of all 40 Lakeview Cabin Collection achievements.
Throw a friend into the woodchipper
Beat Lakeview Cabin III with everyone alive
See the family portrait
Kill 30 zombies in one run
Get three of your friends to "return"
Burn the enemy to crisp.
Collect all records
Drop the windvane on an enemy
Get the dog to survive till the end
Finish the game with everyone missing a leg
Hack up your friends
Defeat the sewer monster
Push the bed to the limit
Beat Lakeview Cabin IV with everyone alive
Save the poor soul
Kill the barn inhabitant
Open all the secret doors in one game
Get to the attic without raising the alarm.
Collect 5 bags of gold
Redemption
Sympathy
Tragedy
Get a score of 50 in "Super Dad"
Beat Lakeview Cabin VI with everyone alive and 10 NPCs saved.
Get rid of the weird smelly stains
Drink all the beer you can find
Save at least 15 crew members
Wear all five masks at the same time
Beat all four episodes
Get a score of 50000 in "Space Psychos"
Beat the Minisode "Last Christmas"