1000 in RFA is pretty tough, but he also completed Raiden IV, Espgaluda II, Death Smiles, Metal Slug 3, and Daifukkatsu 1.5 which are even harder. Plus a bunch of other tough games like Ikaruga, Catherine, Ninja Gaiden II, Triggerheart, etc.
Raiden IV is especially hard though. Anyone who can complete that legitimately is a monster.