What where Michael Collins' motives and aims?

Answer 1

His aim was to free Ireland, to get the Britsh out from Ireland.

To help preserve and encourage Irish culture through such things as the promotion and use of Gaelic and Gaelic sports - he was president of the Irish Republican Brotherhood in London and organised Irish sporting events to this end (before returning to Ireland to fight)

Getting the Brits out of Ireland was a necessary component to achieve the above. Freedom and justice for the Irish people clearly became the main objective once he took control of the IRA.