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