For all executed trades you will receive a confirmation by email and also receive a PDF confirmation inside your Account tab on Stake. PDF confirmations are available around 1 day after the trade date.
In terms of email confirmations, you may receive multiple email confirms if you trade was:
A fractional trade with more that one share (i.e. 4.3432 units) - the fractional component and the whole share component will appear on different emails.
Your trade was executed through multiple trades - this is common for larger trades which get executed at different times due to market liquidity.
A partial fill or execution means that only some of your order got filled. This is only likely to happen with a limit order where a percentage of your resting order did not trade. In this event you will only receive a confirmation for the executed component.
If your Limit order is cleared at the end of the day (Limit orders are currently only good-for-day) you will not have the rest of your order executed unless you re-enter that order.