Exhibit 31.1

Certification of Chief Executive Officer pursuant to Exchange Act Rules 13a-14

and 15d-14, as adopted pursuant to Section 302 of Sarbanes-Oxley Act of 2002

I,
Michael D. Kishbauch, certify that:



|1. | I have reviewed this Quarterly Report on Form 10-Q of Achillion Pharmaceuticals, Inc.;
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|2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in
light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
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|3. | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial
condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;
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|4. | The registrants other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act
Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15(d)-15(f)) for the registrant and have:
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| | a) | Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material
information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this annual report is being prepared;
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| | b) | Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide
reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
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| | c) | Evaluated the effectiveness of the registrants disclosure controls and procedures and presented in this annual report our conclusions about the effectiveness of
the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and
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| | d) | Disclosed in this report any changes in the registrants internal control over financial reporting that occurred during the registrants fourth fiscal quarter
that has materially affected, or is reasonably likely to materially affect, the registrants internal control over financial reporting; and
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|5. | The registrants other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the
registrants auditors and the audit committee of registrants board of directors (or persons performing the equivalent functions):
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| | a) | All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely
affect the registrants ability to record, process, summarize and report financial information; and
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| | b) | Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants internal control and financial
reporting.
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/s/ MICHAEL D. KISHBAUCHMichael D. KishbauchChief Executive Officer


Dated: November 6, 2009