Philae is 3rd spacecraft landing on a “comet”

what comet asteroid landed on missions
Philae lander and comet or asteroid 67P

The Philae landers crash landing on Comet Churyumov–Gerasimenko (comet 67P) is actually the 3rd spacecraft landing on a comet, as asteroids and comets are from the same family of objects - comets are just active asteroids.

1st asteroid landing - NEAR Shoemaker spacecraft and asteroid Eros

list asteroids comets landed spacecraft
Asteroid Eros - 1st on the list of successful landings by a spacecraft

In 2001, after NASA's NEAR spacecraft intensely studied the near-earth asteroid Eros for more than a year from orbit, mission controllers decided to try and land the spacecraft. Although it wasn't designed for landing, NEAR successfully touched down, setting the record as the first to successfully land on an asteroid.
Asteroids: Formation, Discovery and Exploration

2nd asteroid landing - Hayabusa and asteroid 25143 Itokawa

list asteroids comets landing successful
asteroid 25143 Itokawa 2nd successful landing

Both Hayabusa and MINERVA experienced complications during landing attempts, Hayabusa landed on the asteroid and sucked a small amount of debris into a sample container. MINERVA probably drifted off into space instead of landing.
Missions to Asteroids - Hayabusa

3rd asteroid landing - Rosetta missions Philae spacecraft and asteroid 67P

asteroid comet landing list missions - comet 67p
Philae crash landed on active asteroid 67P

This is the first image ESA released taken by Philae from the comet. It shows one of the lander’s legs settled at the base of a rocky comet cliff.
The Philae Spacecraft Landed in the Shadow of the Comet’s Cliff

Comet/asteroid landing lists links

List of asteroids visited by spacecraft
List of comets visited by spacecraft