whole DC raid is "soloable" aswell but you need good timing at the boss where you need to incinerate him with the dragon, otherwise it will take VERY VERY long
the boss which ccs you also needs a good timing otherwise you will be trapped and need to wait long until you die

the part with the 2 gatekeepers you can pull one to the other and kite him all the way
teps pyramid is the fastest soloraid;
catherina and others cant be soloed due to mechanics