I'm so glad that we've reached an agreement on the contract. 

我非常高兴我们就这一合同达成一致。 

 

Let's congratulate ourselves that this transaction has been brought to a successful conclusion. 

祝贺我们圆满达成交易。 

 

I'm glad that our negotiation has come to a successful conclusion. 

很高兴我们的谈判取得了成功。 

 

 

reach an agreement on (在……达成一致) 

 

Tip: agreement名词，意思是"一致;协定"既可作可数也不可数。反义词为 disagreement(不一致;分歧)。用作 [U]意为"同意，意见一致，相合"。例如 We are in agreement with their decision. (我们同意他们的决定。 ) (be in agreement with同意……)，用作 [C]意为"(口头或书面)协定，协议"。例如: We came to/ arrived at/made/ reached an agreement with them on this matter.在这个问题上，我们与他们达成了协议。 (come to/ arrive at/ make an agreement with... 与……达成协议)。相关词组有：a gentlemen's/ gentlemen's agreement君子协定，break one's agreement破坏协议。