Make a for-each for All fields

I need to make a for each to display all fields assigned to an item in the category view.

Is there any simple code where I code use? I am no expert guys, I am thinking in something like this:

You mean you want to display all field label of fields assigned to the Content Type of the item?

Exacly.

Currently in the category_items.php this is the code:

<!-- BOF under-description-line1 block -->
<?php if (isset($items[$i]->positions)) : ?>
<div class="lineinfo line3">
<?php foreach ($items[$i]->positions as $field) : ?>
<span class="element">
<?php if ($field->label) : ?>
<span class="label field_<?php echo $field->name; ?>"><?php echo $field->label; ?></span>
<?php endif; ?>
<span class="value field_<?php echo $field->name; ?>"><?php echo $field->display; ?></span>
</span>
<?php endforeach; ?>
</div>
<?php endif; ?>
<!-- EOF under-description-line1 block -->

but I want to list all items and the respective fields titles for example. After that I can do the rest.

why don't you use the array of fields of each item:

$item->fields
or
$items[$i]->fields

this contain the fields of the item you can do this to see the contents:
The above contains the fields of the item that are published and have the access level of current user,
... regardless of having value or not

That works perfect.

I have duplicate view.html.php (cateogry view) to view.html2.php

currently this view is limiting the number of items per PAGE what can I change in order to list ALL active item in this cateogry? Thanks.

I don't want to change the category option, I want to change the VIEW CODE in order to list all.

In the your new file, just before:

Try adding:
JRequest::setVar('limit', 9999);