To install Achievo, you need a webserver with PHP5 support, and a database server (MySQL5+ is fully supported, PostgreSQL and Oracle support is present but may not be fully functional). Unzip the Achievo archive somewhere in your webservers' documentroot, and read the installation instructions (in the doc/INSTALL file after you unzipped Achievo, or online.
When upgrading from a previous version of Achievo, no database patch is necessary. If you use the docmanager for uploading files check the configs/docmanager.inc.php if all upload extensions are available for you.
Yesterday we received an email from Stefan Esser which was testing Achievo for the Month Of PHP Security. During the SQL Injection marathon he found one in the script that generates the project graphs. This security bugfix release will fix this issue. Here is the complete list of changes: