Yes he can be killed. The same way the Sentinels did in that alternate future story where they frayed his flesh from his adamantium bones with one those trusty cannons that shoot from their palms. So basically, anyone who can generate enuff psyonic power(Havoc, Magneto,Polaris,Sunfire,Thanos,Adam Warlock, captain Marvel,Thor who could probably beat him beyond his healing powers,Gladiator's heat vision,Apocalypse,Storm,X-man, Iron Man's chest cannon,ESPECIALLY BLACK BOLT AND HIS SONIC SCREAM!!, Dr. Strange,NOT TO MENTION COSMIC BEINGS LIKE GALACTUS WHO WEILD POWER BEYOND THE ABILITIES FOR HUMANS TO MEASURE)can dispose of him easily. I could go on and on, but you get the idea.
list of people with healing factors derived from wolverine or natural (people who are equally difficult to kill):Maverick, Sabertooth, Slayback, Deadpool, Mystique, Mastadon, Fantomex, Captain America, Archangel, Sinister, Cannonball, Sebastion Shaw, Weapon Zero, Agent X
Successful kills: Silver Fox, Apocalypse, Gideon, Nuke, Absolom, Kestrel, Weapon XV
volcano is problematic, magma is relativley cool on the surface and so it takes time to burn through your skin (hence vader surviving his injuries in episode 3), considering his healing factor (and the fact that he's survived a close encounter with the sun in new x-men 149 and shower in some molten, radioactive adamantium in weapon x) logan would have enough time to swim or crawl out and remain relatively unharmed.
Rogue can kill him...isn't Syrin's scream fatal? And you can throw him into a black hole...or you can inject him with iron and have magneto hold him in a big tank of boiling water...or you can strap him down with adamantium straps and stick a needle in his arm and drain him of his blood faster than he can remake it! 🧑⚕️ ...not that I want Wolverine to die ❌ ...my sweetheart 😍
...did God put all these furry little bunnies in my mind to keep me company? 🐰 🐰 🐰 🐰 🐰 🐰 🐰