There are at least three different ways “ch” gets pronounced in English words and that tells you the origin of those words.
1. Latin-origin words used ch
for tʃ/च
sound. For example, “champion” or “channel”.
2. French-origin words used ch
for ʃ/श
sound. For example, “machine” or “champagne”.
3. German-origin words used ch
for x/ख़
sound. For example, Erlich “Bachman” from the Silicon Valley show.