Oh, I've got a few! A lot of these are fantasy-specific, because I've read a LOT of fantasy-fiction, but yeah.
Humble farmboy is secretly a king
This ties into the main-character-is-the-chosen-one cliché, but this one is pretty specifically for high fantasy. If your story starts with your hero being a farmboy, it's a pretty sure bet that he's going to turn out to be the long-lost secret heir to the throne, and he's going to go on a quest that ends with him sitting on that throne again, somehow using the virtues and knowledge he learned on the farm for the proper governance of his kingdom - because we all know that farming rutabagas is totally the best school for learning about international politics and proper taxation-policies!
"It has been foretold in the PROPHECY!"
We all know this one, right? There's a semi-vague-but-in-fact-totally-obvious prophecy about the birth of a hero, or impending doom or the rise of a kingdom or WHATEVER, and everybody's wandering around going "Oooh, I wonder what THIS means?" and then they kind of figure it out and everything happens according to the prophecy. If it has been foretold that some kid is going to be born who is going to be The Chosen One who magically overcomes all trials and defeats the darkness, you can bet your boots that it's going to happen exactly like that.
.... which is just about the most boring thing I can imagine. You're literally giving away the ending right from the start. There's no suspense! You've told us what's going to happen!
Love triangles
Less fantasy-specific, and very much a personal nitpick, but yeah. I cannot stand love triangles, because 99 times out of a 100, they're so badly handled. It's either a.) blindingly obvious who the "right" choice is according to the author, thus removing all suspense, b.) making the central character in the triangle look like an indecisive wet blanket, or c.) cast with a trio of characters who are all exhibiting their worst traits of jealousy, pettiness and aggression.
Specific variants of this that I hate with a passion: 1. Triangles where it's actually two people who are just getting into an established relationship and are still learning how to go about this whole thing - and then BAM! Brand new "love interest" is shoehorned into the story, just to create annoying external conflict, usually exhibited as the hero of a heterosexual relationship going all jealous and overprotective of the heroine, because of course she can't take care of herself. 2. The mini-harem, where it's one main character having to choose between two love interests, but they are SO INDECISIVE about this that it just drags the story out for ever.
Good vs Evil - that's the entire plot.
Most often seen in high fantasy, but present elsewhere as well. The main plot is basically just good vs. evil. No nuances, no doubts, no grey areas - just good vs. evil. The protagonists are all paragons of virtue, children of light, bright and just and all that is good about the world - while the antagonists are sometimes literally just the Dark Lord, with armies of evil backing them up in their pitch-black fortress of evil and darkness.
It's just... so boring. In 99.99% of the cases, we know the good side is going to win. And it's nearly always obvious when a story isn't going to be that 00.01%.
This is the prologue that never ends
You wanna read this story? TOO BAD WE'VE GOT A 20-PAGE PROLOGUE TO WADE THROUGH FIRST! Oh, and it's all about stuff that happened hundreds or thousands of years before the story starts - bonus points if it's about the gods, or includes a prophecy! - that you really don't have any cause to care about because you don't even know who the protagonist is yet. You haven't even seen them yet, because the prologue is getting in the way.
Elves are elves, dwarves are dwarves, and this is Totally Not Clichéd Medieval Europe.
Stop me if you've heard this before - elves are all and graceful and beautiful and love music and live in the woods and live forever and are sad about it. Dwarves are bearded and war-like and way into blacksmithing and live in caves and hate elves. All humans live in towns that look like the backdrop in A Knight's Tale, because "pseudo-medieval Europe" is the only setting possible for fantasy stories.
Oh - and it's a pseudo-medieval Europe where everybody is white, because we all know that people of colour weren't invented until the 1800s - or if they were, absolutely never in pseudo-European settings. At best, people of colour are exotic civilisations that live far away and maybe show up as eccentric merchants to add a bit of flavour - at worst, they are all identical copies of each other, speak with an accent and are all secretly evil on the genetic level.
This one annoys me so much. It's a fantasy story. You have your entire imagination at your disposal, and the best you can come up with is pseudo-medieval Europe? NOTHING is stopping you from putting absolutely anything in your story. Want islands floating in the sky? Do it! Want mountains made of crystals and nomadic civilisations living on the backs of giant hermit-crabs? Go ahead, knock yourself out! Want magical creatures based on obscure Slavic folklore and repurposed pieces of Native American mythology? NOTHING IS STOPPING YOU (except a respect for the people whose culture those things belong to).