The acquisition date is used to determine if a sale of capital assets will be given long-term or short-term tax treatment; so you'll need to enter a value (or values, if using multiple sales subtotals) that accurately reflects whether these are sales of assets you have held for at least 1 year or not. If your 1099 does not report the necessary information, you'll need to rely on your broker records.
Assets held for over a year get favorable long-term capital gain treatment when sold, and so attention-to-detail could impact your bottom line - do all of the acquisition dates qualify as either all long-term or all short-term sales? If so, you can enter the most recent date to reflect that character across all the sale lots combined.
If some of the acquisition dates were at least a year before the date of sale, and some were within 1 year of sale, then you'll need to break those out separately, and report additional sales totals for the portion that is short-term in nature.
See: TurboTax - Capital Gains and Losses
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