Meaning : To gain with effort.
Example :
She achieved her goal despite setbacks.
Synonyms : accomplish, achieve, reach
Meaning : Find unexpectedly.
Example :
The archeologists chanced upon an old tomb.
She struck a goldmine.
The hikers finally struck the main path to the lake.
Synonyms : chance on, chance upon, come across, come upon, discover, fall upon, happen upon, light upon, strike