Walkthrough 1/3: (Use the action/use button for all of this.) Press the intercom, and enter the house. Talk to the woman, take the key. Go up, and to the left. Enter the left door. Click the cups to the left and the green frame. Go back to the reception and click on the door. The combination is 1578, the year the house was built. Go inside and take the keycard. Use the keycard on the device next to the computer and pick it up again. Leave the room, and go up. Click the keycard reader to the right, and then go right. Go through the middle door. Click the pictures to note the year 1974. Next click the green jacket, take the key that falls out. Go back, then enter the right-most door. Take the carpet roll. Go outside the house, and one screen to the right. Click the wooden door and go inside the outbuilding. Click the water pipe, and take the rope and spanner. Go back outside and one screen to the right. Click the green car.
Walkthrough 2/3: Go back inside the house and go right. Go through the right door into the kitchen. Click the right door and pick up the vinegar. Go through the left door into the basement. Click the pipe to the left and take the wheel handle. Click the dark blue switch and pick it up. Go back outside of the house and go left. Click the arrow to the left to go to the orangery. Click the door, and enter the code 1974. Go inside, and click the green plant. Pick up the bamboo and the crowbar. Go back to the outhouse. Click the electrical thing to switch it off. Go outside, and go all the way to the right, then down. Click the pipe at the left, and then click the mire to the right and walk over it. Click the ash and take the tome. Go back to the front of the house. Back up one screen, and go right. Go down the fountain. Click the bottom rung, and go down. ake the statuette, then go further down. Click the remains and take the pendant.
Walkthrough 3/3: Go back inside the house and go left. Go through the left door and click the fireplace, then the statuette. Go through the revealed door. Click the right stone tablet. Go back two screens and now go through the right door. Click the frame to get the sheet music. Go back to the attic where you found the carpet roll. Click the pipe organ. Take the key and go through the door to the right to go to the tower. Click the wooden chest and take the crest. Go outside the house, go right three times, then up. Click the crypt door and go inside. Click the yellow chest and get the toy. Go right and do the same. Go left twice and click the panel, then click the dirty cog. Go back to the basement in the house. Click the blue container to dip the cog in lye, then pick it up again. Go back to the crypt and replace the cog. Click the purple portal. Now help all spirits: one at the driveway entrance south of the house, one at the right-most screen with the ash, and one in the tower.
I think the respawn/disappear rates are based on your computer clock rather than an in-game timer. I just played Lava with some heavy lag and some of the targets would disappear mid-air and respawn as new targets at the top. Stopped at a 1000 kills, but could've easily gone further. Maybe something to look into?
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For 250 survival kills, just get a turret without bothering with purchasing anything else. Run around it with shift while holding space for movement speed.
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Thank you!