Hi,
After reviewing my story I have realised that I have included two cliches:
1. The main character is "the chosen one". However this is heavily used in The Matrix.
If you think the Matrix is the only recent work of spec fict that heavily draws on the chosen one trope, then you need to read and watch more SFF
Seriously, though, it's a trope because it appeals to people and has been doing so for centuries. If you have a compelling story with a fascinating protagonist, people will still enjoy it.
2. At one point the main character is knocked unconcious.
Being knocked unconscious happens a lot in fiction, and the main problem people have with it is that it's often portrayed in a way that's unrealistic from a medical standpoint. Writers will also sometimes use it to avoid writing an awkward connecting scene or having to decide what to summarize and what to show in more detail when a character is being transported somewhere.
But if you research the situation and if you're not using it for lazy reasons, then it can certainly be a part of your story.
Fixing them shouldn't be to difficult and will improve the story but are there any other clichés I should avoid at all costs?
You can spend hours on a site like TV tropes and get that sick feeling that everything in your story has been done before. This is because it has. There is nothing new under the sun. In fact, stories need an element of predictability. They also need to have an element of novelty. The challenge lies in combining familiar, even predictable, elements in a way that is fresh and fun.
Critting partners can help you determine whether or not you're handling the various tropes of fiction in a way that seems trite or cliched.
The cliches I try hardest to avoid in my own writing are the ones that
1. Convey inaccurate information about things, especially when they are easy to research and portray accurately (like portraying getting hit on the head hard enough to be unconscious for hours as a minor injury where the person wakes with a slight headache and can start running around without consequence).
2. Perpetuate cliches or stereotypes that are harmful or offensive to people who have traditionally been under or misrepresented in storytelling or by society as a whole.