Originally Posted by
sir
...but we're asking for specific achievements' descriptions, not all currently availble and added already?
oh shit. I'm sorry. I didn't read too good. I thought it was asking for new achievements.
In that case, for clan streak:
Tier 1, "Break down the competition!".
Tier 2, "Let no others stand in your path!".
Tier 3, "Amazing! You beat the competition into the ground!"