Yep, that's right. What happens when casting/resolving a spell that targets is that, when you cast it, it needs legal targets for
every instance of the word "target" on the card. When it's resolving, it needs
at least one legal target, otherwise it fizzles. Basically, if a card targets once or more, it needs at least one legal target and it will do everything that it has legal targets and everything that doesn't require targets, but will skip effects that no longer have targets. Does that make sense?
So
Remand has "counter target spell", and "draw a card" as different effects. Even though the draw effect doesn't target, the spell does, so the entire spell fizzles if it doesn't have at least one target (for the counter effect.)
For
Path to Exile, the second clause is dependant as nfelix said, because it's part of the same effect. If it had another line saying "put a +1/+1 counter on target creature" and you targeted something else for the counter, but cloudshifted your knight, you would not get the land because that effect is invalid, but the spell wouldn't fizzle, and you'd still get the counter.
I hope that makes sense.