I revised the sentences again. Now I really need your final check

At the end of their two-year project students will be able to

1) master the basic linguistic structures to operate in a work/scientific environment (I don't know how to express it)
2) be familiar with the lexical and skills syllabus of the terms used to describe aquatic biodiversity
3) explain, interpret, exchange and finally compare the results of their experiments in English both in its written and oral forms.
4) write reports about the results of their findings
5) reinforce (upgrade) their reading skills which they will need to analyze and interpret data derived from different types of sources such as WebPages, books, scholarly journals and large databases.

You'll need to be able to measure these objectives. How do you measure "master" or "be familiar" or "reinforce"? The verbs in objectives need to state what students will DO in order to show whether they met each objective. What you wrote for #4 and #5 are perfect -- good, strong, specific verbs!

... students will be able to ...

1) demonstrate knowledge and regular use of the basic linguistic structures of English to operate in a scientific/work environment.

2) demonstrate minimum competence with the lexical and skills syllabus of the terms used to describe aquatic biodiversity.

3) explain, interpret, exchange, and compare the results of their experiments in English both in its written and oral forms.

4) write reports about the results of their findings.

5) demonstrate growth and improvement in their reading skills as they analyze and interpret data derived from different types of sources such as webpages, books, scholarly journals, and large databases.

("demonstrate" can mean taking a test, giving a formal presentation to a panel of judges, etc.)

Sorry!! Too early in the morning for me!

Corrected:
What you wrote for #3 and #4 are perfect -- good, strong, specific verbs!

Overall, your revised sentences look good. However, I have a suggestion for expressing the first point more clearly. Here is the final check and explanation for each sentence:

1) "At the end of their two-year project, students will be able to master the basic linguistic structures necessary to effectively operate in a work or scientific environment."

Explanation: To express this point more clearly, you can mention that the purpose of mastering the basic linguistic structures is to operate effectively in a work or scientific environment.

2) "At the end of their two-year project, students will be familiar with the lexicon and skills required to describe aquatic biodiversity."

Explanation: This sentence is fine as it is. It states that students will gain knowledge of the vocabulary and skills necessary to describe aquatic biodiversity.

3) "At the end of their two-year project, students will be able to explain, interpret, exchange, and compare the results of their experiments in written and oral English."

Explanation: This sentence is clear and conveys the expected outcome that students should be able to effectively communicate and analyze their experimental results in both written and oral English.

4) "At the end of their two-year project, students will be able to write reports about their findings."

Explanation: This sentence is straightforward and states that students will acquire the ability to write reports summarizing their findings.

5) "At the end of their two-year project, students will reinforce their reading skills, which are necessary for analyzing and interpreting data from various sources such as webpages, books, scholarly journals, and databases."

Explanation: The revision accurately conveys that students will strengthen their reading skills, which will be important for analyzing and interpreting data from different types of sources.