A320 pitch trim is electric, no hydraulics required.
IIRC the rudder has mechanical backup, so no hydraulics required.
Differential thrust and gravity gear drop complete everything you need to land, apparently the airbus test pilots land in this configuration as their party piece so it is possible.
However, the chances of loosing everything hydraulic when you have three independent systems with yellow and green engine driven pumps (that can operate with a windmilling engine as low as 7% n2), blue and yellow electric pumps, yellow to green (and vice versa) PTU and a blue RAT are, shall we say, slim.
LD