This command instantly researches all non-repeatable technologies. You have the option of adding <span class="parameter parameter-primary">1</span> after the command to include space creatures and crisis tech.
research_all_technologies <span class="parameter parameter-primary">1 or 0</span>
research_all_technologies 1 4
How to open the console in Stellaris
Press the ~ / ` key to open the command console. This key is located at the top left of the keyboard, usually under the F1 or ESC key. Type the command and press the Enter key.