In configuration->Data Collection you can disable your click tracking. Then in the Configuration->Plugins: disable the "AcyMailing : Statistics Plugin", " AcyMailing : Handle Click tracking part1" and " AcyMailing : Handle Click tracking part2" plugins. Then AcyMailing will stop saving statistics and it will stop adding a tracking pixel.
In case you do not want to load remote images you can include them in your mail enabling Embed images in Configuration->Mail Configuration.
Please not that most mail clients still do not show the images by default. Also, when embedding images the size of your messages is increasing which will result in a slower sending speed.