OK don't panic. Not all those things will need doing immediately, and some of them might be "nice to have's".
Damp proofing you need to do and that includes re plastering and re skirting the ground floor. You might have rotten joists in the floor (if you do the floors will bounce) but it's not the end of the world.
They always say drainage survey. Is there any reason to suspect a blockage? (mind the one time I did witness one a broken pipe was found, sorry)
Walls, floors and ceilings, is it just a dilapidated old place with some crumbly old plaster. I'll tell you a secret, you can live with that! You just need thick wallpaper and to be circumspect about where you put up shelves. Are they assuming they'd need replacing for cosmetic reasons?
Look on the bright side: is the roof sound? Is there any subsidence? If the worst of it is damp proofing and cosmetic updating then it shouldn't be too bad. Old houses are notorious for unpleasant surprises but you don't want those biggies.