ACHN 2018 Proxy Statement

In Person at the Annual Meeting: If you attend the Annual Meeting, you may deliver your completed proxy card in person or you may vote by completing a ballot, which we will provide to you at the Annual Meeting. Voting of Shares Held in Street Name. If your shares are held in “street name,” meaning they are held for your account by a broker or other nominee, you will receive instructions from your broker or other nominee regarding how to vote your shares over the Internet or by mail. You should follow those instructions. If you wish to vote your shares in person at the Annual Meeting, contact your broker or other nominee who holds your shares to obtain a brokers’ proxy card and bring it with you to the Annual Meeting. You will not be able to vote in person at the Annual Meeting unless you have a proxy from your broker issued in your name giving you the right to vote your shares. Voting of Proxies at the Annual Meeting. All properly executed proxies that we receive prior to the vote at the Annual Meeting, and that are not revoked, will be voted in accordance with the instructions indicated on the proxies or, if no direction is indicated, to approve Proposals 1 through 4. Properly executed proxies will also be voted for any adjournment or postponement of our Annual Meeting for the purpose of soliciting additional votes to approve Proposals 1 through 4, if necessary. In addition, if any other matters properly come before the Annual Meeting, it is the intention of the persons named in the enclosed proxy card to vote the shares they represent as directed by the Board of Directors. We have not received notice of any other matters that may properly be presented at the Annual Meeting. Broker Non-Votes; Abstentions In the absence of controlling precedent to the contrary, we intend to treat broker non-votes and abstentions in the following manner: A broker “non-vote” occurs when a nominee holding shares for a beneficial owner does not vote on a particular proposal because the nominee does not have the discretionary voting power with respect to that item and has not received instructions from the beneficial owner. Broker “non-votes” and shares as to which proxy authority has been withheld with respect to any matter are considered present for purposes of calculating a quorum but are not deemed to be entitled to vote for purposes of determining whether stockholder approval of that matter has been obtained. As a result, broker “non-votes” are not included in the tabulation of the voting results on any proposals requiring a plurality or the approval of a majority of the shares of common stock present or represented and voting on such matters and, therefore, do not have any effect on the voting proposals. Abstentions occur when a stockholder entitled to vote and present in person or represented by proxy affirmatively votes to abstain. Votes in abstention are considered present for purposes of calculating a quorum but do not have any effect on the voting on any proposals. Solicitation of Proxies We will pay for all costs incurred in connection with the solicitation of proxies from our stockholders on behalf of our Board of Directors, including assembly, printing and mailing of this document, its related attachments and the proxy card. Copies of solicitation materials will be furnished to banks, brokerage houses, fiduciaries and custodians holding in their names shares of our common stock beneficially owned by others to forward to such beneficial owners. In addition to solicitation by use of the mail, our directors, officers, employees and agents may solicit proxies by telephone, email, facsimile and in person, without additional compensation. Upon request, we will reimburse brokerage houses and other custodians, nominees and fiduciaries for their reasonable out-of-pocket expenses for distributing proxy materials. 4