In lang=en terms the difference between achieve and trigger
is that
achieve is to obtain, or gain (a desired result, objective etc), as the result of exertion; to succeed in gaining; to win while
trigger is to spark a response, especially a negative emotional response, in (someone).
As verbs the difference between achieve and trigger
is that
achieve is to succeed in something, now especially in academic performance while
trigger is to fire a weapon.
As a noun trigger is
a finger-operated lever used to fire a gun.