you need to die a total of 2550 times and you need to jump a total of 15000 times

The basic, harder, way to complete these achievements is to play on the "endless" level and just spam the space bar to jump, and restart every time you die.

The easier way to 100% this game is with a spacebar spam script using autohotkey. You can write your own or copy the script from pastebin:
https://pastebin.com/3wBHJ6G1#:~:text=Autohotkey%20spacebar%20script%201%20%3B%20Download%20autohotkey%20at,the%20spacebar%20spam%20on%20and%20off.%20More%20items

position the cursor over the "restart" box before enabling the script.