Bearing in mind that she came into office in 1979, her first real achievement was dragging us out of the 1950's - and then when Scargill tried to usurp power through the unions, she showed real balls by taking him on head to head and demonstrating that she was the elected power, not him.
As for the poll tax, it's still the fairest way to levy tax (i.e. pay your own way), and the fact that Scotland got it first is incidental - if it had been levied in Liverpool (another socialist enclave) the reaction would have been the same. You could say it was the first round of the battle against the benefits culture in the UK.
Let's not forget she also refused to give the Falklands up, and stood up to most of the European silliness, and as someone has already said, maybe her biggest achievement was allowing people to buy their own homes, but that has now come back to bite us, and until profits on house sales are taxed heavily and the housing market is killed stone dead, my 25-year old boy will never be in a position to buy a house.
Over to you, Ace...