What you need to "fix" is the last <li> of the list, not the last <a>. That’s because the <a> is the son of <li> and is not exactly on the list. You should also apply the other properties to <li>, and not us <a>. For example, here:
ul.lista li,
ul.lista li a {
  list-style: none;
  list-style-image: none;
  list-style-type: none;
}
You are resetting properties of <a> that do not exist.
It should just be:
ul.lista li{
  list-style: none;
  list-style-image: none;
  list-style-type: none;
}
In this passage also:
ul.lista li a {
  padding: 2px 2px;
  border-bottom: 1px solid #AFAFAF;
}
If you want to make a vertical menu with using list, who should have these edge properties and internal spacing were the <li>, and not the <a>. Would look like this:
ul.lista li{
  padding: 2px 2px;
  border-bottom: 1px solid #AFAFAF;
}
And finally, to fix the last <li>, as reported in the other reply, you should also apply the properties in the last <li> :last-child, and not a:last-child, because otherwise it will apply to all <a> of the list, because all the <a> sane :last-child. Would look like this:
ul.lista li:last-child {
  border-bottom: 0px;
  position: absolute;
  left: 0;
  bottom: 0;
}
Example:
ul.lista {
  height: 200px;
  background: gray;
  position: relative;
}
ul.lista li{
  list-style: none;
  list-style-image: none;
  list-style-type: none;
}
ul.lista li{
  padding: 2px 2px;
  border-bottom: 1px solid #AFAFAF;
}
ul.lista li:last-child {
  border-bottom: 0px;
  position: absolute;
  left: 0;
  bottom: 0;
}
<ul class="lista">
    <li><a href="">Link#01</a></li>
    <li><a href="">Link#02</a></li>
    <li><a href="">Link#03</a></li>
    <li><a href="">Link#04</a></li>
    <li><a href="">Link#05</a></li>
    <li><a href="">Todos</a></li>
</ul>
 
 
							
							
						 
Could elaborate a [mcve] demonstrating what you want to do?
– Woss
@Andersoncarloswoss is exactly what I intend, a north for example, is to fix the last <LI> in height: 500px; regardless of the amount of other <LI> and stay there, I do not know how to do.
– ElvisP
You want the last LI always stick to the base of the parent container?
– hugocsl