Need help with permanent redirects

Hi. I’ve a website (https://www.dhonixpress.com/) which I was running using php includes in the past but just today I installed wordpress. Now, everything is setup fine, I’ve even enabled permanent links. But the problem is, previously the site used urls like:

https://www.dhonixpress.com/index.php?biography
https://www.dhonixpress.com/index.php?achievements

I need to give 301 redirects to these pages. Example:

https://www.dhonixpress.com/index.php?biography should redirect to https://www.dhonixpress.com/biography/ and https://www.dhonixpress.com/index.php?achievements should redirect to https://www.dhonixpress.com/achievements/

For some reason, the usual method doesnt seem to be working… I guess its because of the .htaccess file generated by wordpress? I would appreciate if someone could help me here. My .htaccess file looks like this right now:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

— Naif